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 |
Joelle's family paid $144 for water usage in the month of January. What is the most amount of water that they could have used in January?
Amount that Joelle's family paid for the first 90 m
3 of water usage
= 90 x 1.40
= $126
Remaining amount that Joelle's family paid for additional water usage
= 144 - 126
= $18
Additional water usage
that Joelle's family paid for
= 18 ÷ 1.80
= 10 m
3Most amount of water that Joelle's family could have used in January
= 90 + 10
= 100 m
3 Answer(s): 100 m
3