The table shows the rates charged for the use of water in a country.
- Seth and his family used 35 units of water in May. How much did they pay for the usage of water in May?
- Min and her family paid $200.30 for the usage of water in June. How many units of water did they use in June?
(a)
Amount that Seth and his family paid for the usage of water
= 35 x 0.77
= $26.95
(b)
Amount that Min and her family paid for first 40 units of water
= 40 x 0.77
= $30.80
Amount that Min and her family paid for next 40 units of water
= 40 x 1.47
= $58.80
Amount that Min and her family paid for the remaining units of water
= 200.30 - 30.80 - 58.80
= $110.70
Remaining units of water that Min and her family used
= 110.70 ÷ 2.46
= 45
Total number of units of water that Min and her family used
= 40 + 40 + 45
= 125
Answer(s): (a) $26.95; (b) 125