The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 50 g |
60¢ |
90¢ |
Every additional 10 g |
25¢ |
35¢ |
Ben paid $3.90 for posting a package locally. What was the greatest possible mass of the package that Ben posted?
$1 = 100¢
$3.90 = 3.90 x 100 = 390¢
Amount that Ben paid for the additional sets of 10 g for the local package
= 390 - 60
= 330¢
Number of sets of 10 g that Ben paid for the local package
= 330 ÷ 10
= 33
Mass of 33 sets of 10 g for the local package
= 33 x 10
= 330 g
Greatest possible mass of the local package
= 50 + 330
= 380 g
Answer(s): 380 g