Decimal P6 2009 SA2 P2 MGS Q8

8. 1 bottle of shampoo and 1 bottle of bath foam cost $15.50 altogether. Mrs Yeo bought 3 bottles of shampoo and 5 bottles of bath foam for $59.70. How much did one bottle of bath foam cost?

1 S + 1 F --> $15.50

3 S + 5 F --> $59.70

3 S + 3 F --> 3 x 15.50 = 46.50

2 F à 59.70 – 46.50 = 13.20

1 F -- > 13.20 ÷ 2 = $6.60

One bottle of bath foam cost $6.60.

Decimal P6 2009 SA2 P2 MGS Q11

11. The table below shows the charges incurred when making overseas phone call.

Miss Ong made an overseas phone call which lasted 25 ½ min. How much must she pay for the overseas phone call?

25 ½ - 5 = 20 ½

First 5 min -- > $8.00

Balance 20 ½ min -- > 21 x 0.15 = $3.15

3.15 + 8.00 = $11.15

She must pay $11.15 for the overseas phone call.