The table shows the rates charged for the use of water in a country.
- Sean and his family used 35 units of water in April. How much did they pay for the usage of water in April?
- Barbara and her family paid $142.20 for the usage of water in May. How many units of water did they use in May?
(a)
Amount that Sean and his family paid for the usage of water
= 35 x 0.76
= $26.60
(b)
Amount that Barbara and her family paid for first 40 units of water
= 40 x 0.76
= $30.40
Amount that Barbara and her family paid for next 40 units of water
= 40 x 1.13
= $45.20
Amount that Barbara and her family paid for the remaining units of water
= 142.20 - 30.40 - 45.20
= $66.60
Remaining units of water that Barbara and her family used
= 66.60 ÷ 2.22
= 30
Total number of units of water that Barbara and her family used
= 40 + 40 + 30
= 110
Answer(s): (a) $26.60; (b) 110
