The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 40 g |
45¢ |
85¢ |
Every additional 10 g |
15¢ |
35¢ |
David paid $3.75 for posting a package overseas. What was the greatest possible mass of the package that David posted?
$1 = 100¢
$3.75 = 3.75 x 100 = 375¢
Amount that David paid for the additional sets of 10 g for the overseas package
= 375 - 85
= 290¢
Number of sets of 10 g that David paid for the overseas package
= 290 ÷ 10
= 29
Mass of 29 sets of 10 g for the overseas package
= 29 x 10
= 290 g
Greatest possible mass of the overseas package
= 40 + 290
= 330 g
Answer(s): 330 g