The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 70 g |
55¢ |
90¢ |
Every additional 10 g |
25¢ |
40¢ |
Glen paid $5.10 for posting a package overseas. What was the greatest possible mass of the package that Glen posted?
$1 = 100¢
$5.10 = 5.10 x 100 = 510¢
Amount that Glen paid for the additional sets of 10 g for the overseas package
= 510 - 90
= 420¢
Number of sets of 10 g that Glen paid for the overseas package
= 420 ÷ 10
= 42
Mass of 42 sets of 10 g for the overseas package
= 42 x 10
= 420 g
Greatest possible mass of the overseas package
= 70 + 420
= 490 g
Answer(s): 490 g