MEANING OF PERCENTA ratio of a number to 100 is called a percent.

Percent means per hundred, and is represented by the symbol %.

Any ratio with 100 as the second number can be expressed in three ways. You can write the ratios as a fraction, a decimal, and a percent.

0.25 25%10025

USING AND FINDING PERCENTSThere are two ways to find the percent of a

number. The decimal method, and the proportion method.

Example: Find 30% of 80

Decimal Method

FINDING THE PERCENT OF A NUMBER: PROPORTION METHOD

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What is 20% of 35?

What is 55% of 60?

What is 40% of 80?

What percent of 40 is 26?

What percent of 120 is 42?

25% of what number is 6?

7% of what number is 63?

Southwest Airlines passenger plane has a capacity of 150 passengers. On the Monday flight there were 63 passengers. What percent of seats on the plane had passengers in them?

Marie put $17 into her savings account last week. This is 85% of the amount she earned on her paper route. What amount did she earn?

A discount is the amount that an item is reduced from the regular price. The sale price is the regular price minus the discount.

Best Buy has the new Bose IPOD speakers for $300. The Sunday paper offered a 35% off coupon for Best Buy.

How much would you save? (Discount)

How much would you pay? (Sale Price)

The regular price of the car stereo is $110.00. It is marked 25% off. Find the discount and the sale price.

Gander Mountain is offering a 40% discount off the regular price of a lantern. If the sale price is $90,

what was the regular price?

Tax is the percent of the total bill that is ADDED on.

Tip is the percent of the subtotal, price before tax, that you leave the waitress/waiter.

The subtotal listed on Diana’s receipt from Wal-Mart, was $42.39. If the sales tax is

8.25%, what was Diana’s total for her purchase?

Our family went to dinner at the Cheesecake factory to celebrate my

parent’s Anniversary. Since we had a party of 6 or more, an 18% gratuity, tip, was automatically added on. What was

the tip if our bill before tax, came to $89.58?

Mr. Cancino took the band to the Spaghetti Wherehouse before going to see the Nutcracker

ballet. If the bill before tax was $296.83, tax was 7.5%, and he left a 20% tip, how much did the

dinner cost him?

Mr. Smith bought two shirts that cost $29.95 each, and a tie that cost $25.50. The sales tax was 7%. How much change should he have received if he paid with a $100 bill?

Commission is the percent of your amount of sales. Sometimes given to a sales worker who does not get a tip, such as a car salesman.

Betty sells $500 worth of clothes today at Nieman Marcus. If her commission rate is 12.5% , how much commission did she earn today? (commission rate x sales)

A sales agent earns a weekly salary of $650, plus a commission of 4% on all sales. His sales this week are $1,250. How much does he earn?

Kelly is a real estate agent who receives a commission of 6% of the selling price of each house she sells. The seller of the house pays Kelly’s commission out of the sale price and keeps the remainder. What should be the sale price of each house if the seller wants to keep $61,000?

Sheldon Beakman sells computer hardware for a computer firm. He is paid 4% commission on the first $6,000.00 sales, 6% on the next $10,000.00, and 8% on sales over 16,000.00. What is his commission on $24,550.00 of sales?

When you deposit money in a bank, the bank pays you for the use of your money. When you borrow money from the bank, the bank charges you for the use of their money.

Interest is the amount of money paid for the use of money. Interest is calculated at a certain percentage rate called the interest rate.

Principal is the original amount you deposited or borrowed.

Simple interest is interest calculated only on the principal. trpI

Interest = principal x interest rate per year x the time in years.

You deposit $120 in an account that earns 5% simple interest. Find the balance in the account after 3years.

A student deposits $200 in a bank account. The simple interest rate is 6 ½ % per year. Find the interest the account earns in 4 years.

You deposit $1,000 into an account. At what simple interest rate will the balance be $1,240 after 180 months?

Increase – To add; go up

Decrease – To subtract; go down

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During September, $75 was spent on travel. In October, the amount spent on travel was $93. Find the percent of increase.

Mike weighed 200 pounds last year. This year he weighs 165. What is the percent

of change in his weight?

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Which of the following represents the greatest percent of change?

A) A person who spent 60 minutes a night studying, and now spends 90 minutes a night.

B) A block of ice that weighed 95 pounds, now weighing 60 pounds.

C) A pair of shoes originally priced $49.95, on sale for $39.95.

D) A person who originally ran the mile in 8.5 minutes now running it in 7 minutes.

A) A person who spent 60 minutes a might studying, and now spends 90 minutes a night.

B) A block of ice that weighed 95 pounds, now weighing 60 pounds.

C) A pair of shoes originally priced $49.95, on sale for $39.95.

D) A person who originally ran the mile in 8.5 minutes now running it in 7 minutes.