The table shows the rates charged for the use of water in a country.
- Ivan and his family used 15 units of water in February. How much did they pay for the usage of water in February?
- Yoko and her family paid $95.10 for the usage of water in March. How many units of water did they use in March?
(a)
Amount that Ivan and his family paid for the usage of water
= 15 x 0.97
= $14.55
(b)
Amount that Yoko and her family paid for first 30 units of water
= 30 x 0.97
= $29.10
Amount that Yoko and her family paid for next 30 units of water
= 30 x 1.51
= $45.30
Amount that Yoko and her family paid for the remaining units of water
= 95.10 - 29.10 - 45.30
= $20.70
Remaining units of water that Yoko and her family used
= 20.70 ÷ 2.07
= 10
Total number of units of water that Yoko and her family used
= 30 + 30 + 10
= 70
Answer(s): (a) $14.55; (b) 70
