The table shows the rates charged for the use of water in a country.
- Perry and his family used 40 units of water in May. How much did they pay for the usage of water in May?
- Emma and her family paid $127.80 for the usage of water in June. How many units of water did they use in June?
(a)
Amount that Perry and his family paid for the usage of water
= 40 x 0.81
= $32.40
(b)
Amount that Emma and her family paid for first 50 units of water
= 50 x 0.81
= $40.50
Amount that Emma and her family paid for next 50 units of water
= 50 x 1.29
= $64.50
Amount that Emma and her family paid for the remaining units of water
= 127.80 - 40.50 - 64.50
= $22.80
Remaining units of water that Emma and her family used
= 22.80 ÷ 2.28
= 10
Total number of units of water that Emma and her family used
= 50 + 50 + 10
= 110
Answer(s): (a) $32.40; (b) 110
