The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 50 g |
35¢ |
80¢ |
Every additional 10 g |
15¢ |
35¢ |
Liam paid $2.50 for posting a package overseas. What was the greatest possible mass of the package that Liam posted?
$1 = 100¢
$2.50 = 2.50 x 100 = 250¢
Amount that Liam paid for the additional sets of 10 g for the overseas package
= 250 - 80
= 170¢
Number of sets of 10 g that Liam paid for the overseas package
= 170 ÷ 10
= 17
Mass of 17 sets of 10 g for the overseas package
= 17 x 10
= 170 g
Greatest possible mass of the overseas package
= 50 + 170
= 220 g
Answer(s): 220 g