The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 50 g |
55¢ |
90¢ |
Every additional 10 g |
20¢ |
40¢ |
Luis paid $5.60 for posting a package overseas. What was the greatest possible mass of the package that Luis posted?
$1 = 100¢
$5.60 = 5.60 x 100 = 560¢
Amount that Luis paid for the additional sets of 10 g for the overseas package
= 560 - 90
= 470¢
Number of sets of 10 g that Luis paid for the overseas package
= 470 ÷ 10
= 47
Mass of 47 sets of 10 g for the overseas package
= 47 x 10
= 470 g
Greatest possible mass of the overseas package
= 50 + 470
= 520 g
Answer(s): 520 g