The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 40 g |
45¢ |
70¢ |
Every additional 10 g |
20¢ |
25¢ |
Tom paid $2.20 for posting a package overseas. What was the greatest possible mass of the package that Tom posted?
$1 = 100¢
$2.20 = 2.20 x 100 = 220¢
Amount that Tom paid for the additional sets of 10 g for the overseas package
= 220 - 70
= 150¢
Number of sets of 10 g that Tom paid for the overseas package
= 150 ÷ 10
= 15
Mass of 15 sets of 10 g for the overseas package
= 15 x 10
= 150 g
Greatest possible mass of the overseas package
= 40 + 150
= 190 g
Answer(s): 190 g