The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 80 g |
40¢ |
60¢ |
Every additional 10 g |
15¢ |
20¢ |
Vincent paid $5.40 for posting a package locally. What was the greatest possible mass of the package that Vincent posted?
$1 = 100¢
$5.40 = 5.40 x 100 = 540¢
Amount that Vincent paid for the additional sets of 10 g for the local package
= 540 - 40
= 500¢
Number of sets of 10 g that Vincent paid for the local package
= 500 ÷ 10
= 50
Mass of 50 sets of 10 g for the local package
= 50 x 10
= 500 g
Greatest possible mass of the local package
= 80 + 500
= 580 g
Answer(s): 580 g