The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 60 g |
75¢ |
90¢ |
Every additional 10 g |
30¢ |
40¢ |
Jack paid $5.25 for posting a package locally. What was the greatest possible mass of the package that Jack posted?
$1 = 100¢
$5.25 = 5.25 x 100 = 525¢
Amount that Jack paid for the additional sets of 10 g for the local package
= 525 - 75
= 450¢
Number of sets of 10 g that Jack paid for the local package
= 450 ÷ 10
= 45
Mass of 45 sets of 10 g for the local package
= 45 x 10
= 450 g
Greatest possible mass of the local package
= 60 + 450
= 510 g
Answer(s): 510 g