SUGGESTED ANSWERS(Based on 800 students, 3 blocks of buildings and 1000 m2 garden)

PART 1:1.3600 m2 or any reasonable answers.

2.(a)No. of students = 800Volume consumption = 15 l/student/dayTotal water used by students = 800 x 15 l = 12000 l per dayTotal water used for gardening = 1000 x 2 = 2000 l per dayTotal daily water consumption = 14000 l per day

(b)Water consumption per month = 14000 x 22 = 308000 lWater tariff = RM 0.90 per m3Water expenditure per month = (308000 x 0.90) / 1000 = RM 277.20

3.No. of school days per year = 190 daysTabulation method:Year20142015201620172018201920202021202220232024

Population of Students800824849874900927955984101410441075

Annual Water Consumption per Student (l)28502992.503142.133299.243464.203637.413819.284010.244210.754421.294642.35

Total Annual Water Consumption by Students (l)228000024658202667668.372883535.7631177803371879.073647412.43946076.164269700.54615826.764990526.25

Progression:Population of students is a G.P., where a = 800, r = 1.03, t11 = 800 x 1.0310 = 1075.13Annual Water Consumption per student is a G.P., where A = 15 x 190, R = 1.05, T11 = 15 x 190 x 1.0510 = 4642.35 lTotal annual water consumption in year 2024 = t11 x T11 = 4991129.76 l

PART 2:1. (a)Accept any reasonable sketch(b)3 blocks of buildings with dimension 10m x 55m2.6 x 55 x 10 x 3 = 4290 m3Accept any reasonable assumptions2.14 x 5 = 70 m33.(a)Formula:

Eg: Cylinder

Thus, total surface area = 94.03 m2

Tabulation (By Microsoft Excel):Eg: Cylinder

Radius, rHeight, hVolume, VTotal Surface Area, A

50.89115270185.1

41.39242570135.544

32.47542370103.2227

25.5697017095.136

122.278870146.284

1.96.1714147096.36945

25.5697017095.136

2.15.0518837094.37911

2.24.6030597094.05092

2.34.2114947094.11193

2.214.5614967094.0401

2.224.5204947094.03313

2.234.4800427094.02997

2.244.4401317094.0306

2.254.4007517094.03497

2.2314.4760277094.02987

2.2324.4720177094.0298

2.2334.4680137094.02976

2.2344.4640147094.02977

Accept any reasonable answers.

4.Accept any reasonable answersFURTHER EXPLORATION:

1.The total area of three blocks = 10 m x 55 m x 3 = 1650 m2Volume of water harvested per year = 2.6 m x 1650 m2 = 4290 m3Money saved by rainwater harvesting per year = 4290 x RM 0.90 = RM 3861 Accept any reasonable answers

2.Accept any reasonable answers

3.Accept any reasonable answers

REFLECTION: Accept any reasonable reflection.