The table shows the rates charged for the use of water in a country.
- Michael and his family used 15 units of water in April. How much did they pay for the usage of water in April?
- Julie and her family paid $90.60 for the usage of water in May. How many units of water did they use in May?
(a)
Amount that Michael and his family paid for the usage of water
= 15 x 0.96
= $14.40
(b)
Amount that Julie and her family paid for first 30 units of water
= 30 x 0.96
= $28.80
Amount that Julie and her family paid for next 30 units of water
= 30 x 1.23
= $36.90
Amount that Julie and her family paid for the remaining units of water
= 90.60 - 28.80 - 36.90
= $24.90
Remaining units of water that Julie and her family used
= 24.90 ÷ 2.49
= 10
Total number of units of water that Julie and her family used
= 30 + 30 + 10
= 70
Answer(s): (a) $14.40; (b) 70