The table shows the rates charged for the use of water in a country.
- Valen and his family used 20 units of water in March. How much did they pay for the usage of water in March?
- Shiyun and her family paid $90.50 for the usage of water in April. How many units of water did they use in April?
(a)
Amount that Valen and his family paid for the usage of water
= 20 x 0.93
= $18.60
(b)
Amount that Shiyun and her family paid for first 30 units of water
= 30 x 0.93
= $27.90
Amount that Shiyun and her family paid for next 30 units of water
= 30 x 1.29
= $38.70
Amount that Shiyun and her family paid for the remaining units of water
= 90.50 - 27.90 - 38.70
= $23.90
Remaining units of water that Shiyun and her family used
= 23.90 ÷ 2.39
= 10
Total number of units of water that Shiyun and her family used
= 30 + 30 + 10
= 70
Answer(s): (a) $18.60; (b) 70