The table shows the charge for water services provided by the utilities board.
Water consumption |
Rate |
90 m3 of water usage and below |
$1.20 per m3 |
Additional water usage above 90 m3 |
$1.40 per m3 |
Jean's family paid $122 for water usage in the month of December. What is the most amount of water that they could have used in December?
Amount that Jean's family paid for the first 90 m
3 of water usage
= 90 x 1.20
= $108
Remaining amount that Jean's family paid for additional water usage
= 122 - 108
= $14
Additional water usage
that Jean's family paid for
= 14 ÷ 1.40
= 10 m
3Most amount of water that Jean's family could have used in December
= 90 + 10
= 100 m
3 Answer(s): 100 m
3