The table shows the rates charged for the use of water in a country.
- Ivan and his family used 30 units of water in April. How much did they pay for the usage of water in April?
- Hilda and her family paid $149.45 for the usage of water in May. How many units of water did they use in May?
(a)
Amount that Ivan and his family paid for the usage of water
= 30 x 0.89
= $26.70
(b)
Amount that Hilda and her family paid for first 40 units of water
= 40 x 0.89
= $35.60
Amount that Hilda and her family paid for next 40 units of water
= 40 x 1.39
= $55.60
Amount that Hilda and her family paid for the remaining units of water
= 149.45 - 35.60 - 55.60
= $58.25
Remaining units of water that Hilda and her family used
= 58.25 ÷ 2.33
= 25
Total number of units of water that Hilda and her family used
= 40 + 40 + 25
= 105
Answer(s): (a) $26.70; (b) 105
