The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 90 g |
60¢ |
75¢ |
Every additional 10 g |
25¢ |
30¢ |
Warren paid $1.80 for posting a package locally. What was the greatest possible mass of the package that Warren posted?
$1 = 100¢
$1.80 = 1.80 x 100 = 180¢
Amount that Warren paid for the additional sets of 10 g for the local package
= 180 - 60
= 120¢
Number of sets of 10 g that Warren paid for the local package
= 120 ÷ 10
= 12
Mass of 12 sets of 10 g for the local package
= 12 x 10
= 120 g
Greatest possible mass of the local package
= 90 + 120
= 210 g
Answer(s): 210 g