The table shows the rates charged for the use of water in a country.
- Eric and his family used 25 units of water in January. How much did they pay for the usage of water in January?
- Rachel and her family paid $163.35 for the usage of water in February. How many units of water did they use in February?
(a)
Amount that Eric and his family paid for the usage of water
= 25 x 0.94
= $23.50
(b)
Amount that Rachel and her family paid for first 30 units of water
= 30 x 0.94
= $28.20
Amount that Rachel and her family paid for next 30 units of water
= 30 x 1.46
= $43.80
Amount that Rachel and her family paid for the remaining units of water
= 163.35 - 28.20 - 43.80
= $91.35
Remaining units of water that Rachel and her family used
= 91.35 ÷ 2.03
= 45
Total number of units of water that Rachel and her family used
= 30 + 30 + 45
= 105
Answer(s): (a) $23.50; (b) 105
