The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 90 g |
40¢ |
55¢ |
Every additional 10 g |
15¢ |
20¢ |
John paid $3.65 for posting a package overseas. What was the greatest possible mass of the package that John posted?
$1 = 100¢
$3.65 = 3.65 x 100 = 365¢
Amount that John paid for the additional sets of 10 g for the overseas package
= 365 - 55
= 310¢
Number of sets of 10 g that John paid for the overseas package
= 310 ÷ 10
= 31
Mass of 31 sets of 10 g for the overseas package
= 31 x 10
= 310 g
Greatest possible mass of the overseas package
= 90 + 310
= 400 g
Answer(s): 400 g