The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 80 g |
45¢ |
60¢ |
Every additional 10 g |
20¢ |
25¢ |
Vincent paid $2.85 for posting a package locally. What was the greatest possible mass of the package that Vincent posted?
$1 = 100¢
$2.85 = 2.85 x 100 = 285¢
Amount that Vincent paid for the additional sets of 10 g for the local package
= 285 - 45
= 240¢
Number of sets of 10 g that Vincent paid for the local package
= 240 ÷ 10
= 24
Mass of 24 sets of 10 g for the local package
= 24 x 10
= 240 g
Greatest possible mass of the local package
= 80 + 240
= 320 g
Answer(s): 320 g