The table shows the charge for water services provided by the utilities board.
Water consumption |
Rate |
90 m3 of water usage and below |
$1.40 per m3 |
Additional water usage above 90 m3 |
$1.80 per m3 |
Nora's family paid $144 for water usage in the month of December. What is the most amount of water that they could have used in December?
Amount that Nora's family paid for the first 90 m
3 of water usage
= 90 x 1.40
= $126
Remaining amount that Nora's family paid for additional water usage
= 144 - 126
= $18
Additional water usage
that Nora's family paid for
= 18 ÷ 1.80
= 10 m
3Most amount of water that Nora's family could have used in December
= 90 + 10
= 100 m
3 Answer(s): 100 m
3