The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 80 g |
75¢ |
95¢ |
Every additional 10 g |
35¢ |
40¢ |
Peter paid $3.15 for posting a package overseas. What was the greatest possible mass of the package that Peter posted?
$1 = 100¢
$3.15 = 3.15 x 100 = 315¢
Amount that Peter paid for the additional sets of 10 g for the overseas package
= 315 - 95
= 220¢
Number of sets of 10 g that Peter paid for the overseas package
= 220 ÷ 10
= 22
Mass of 22 sets of 10 g for the overseas package
= 22 x 10
= 220 g
Greatest possible mass of the overseas package
= 80 + 220
= 300 g
Answer(s): 300 g