Ai Tong Sch 2009 P6 CA1 Math Paper 2 Q7

The table below shows the rates for water consumption.

a) Find the amount paid for 50 cubic metres of water used.

b) If 7% GST is imposed on the total amount, how much is the GST correct to the nearest 10-cent?

Water Consumption Rates

First 20 cubic metres ----- $1.33 per cubic metre

Next 20 cubic metres ----- $1.46 per cubic metre

Additional amount above 40 cubic metres ----- $1.73 cubic meter

Solution

a)

1st 20 cubic metres --> 20 x $1.33 = $26.60

2nd 20 cubic metres --> 20 x $1.26 = $29.20

Next 10 cubic metres --> 10 x $1.73 = $17.30

Total Amount

--> $26.60 + $29.60 + $17.10 = $73.30

Answer: $73.10

b)

7 % x $73.10 = $5.117

Approximately --> $5.10 (to nearest 10-cent)

Answer: $5.10

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