The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 80 g |
55¢ |
90¢ |
Every additional 10 g |
20¢ |
35¢ |
Tom paid $3.75 for posting a package locally. What was the greatest possible mass of the package that Tom posted?
$1 = 100¢
$3.75 = 3.75 x 100 = 375¢
Amount that Tom paid for the additional sets of 10 g for the local package
= 375 - 55
= 320¢
Number of sets of 10 g that Tom paid for the local package
= 320 ÷ 10
= 32
Mass of 32 sets of 10 g for the local package
= 32 x 10
= 320 g
Greatest possible mass of the local package
= 80 + 320
= 400 g
Answer(s): 400 g