The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 50 g |
40¢ |
70¢ |
Every additional 10 g |
15¢ |
30¢ |
Liam paid $4.70 for posting a package overseas. What was the greatest possible mass of the package that Liam posted?
$1 = 100¢
$4.70 = 4.70 x 100 = 470¢
Amount that Liam paid for the additional sets of 10 g for the overseas package
= 470 - 70
= 400¢
Number of sets of 10 g that Liam paid for the overseas package
= 400 ÷ 10
= 40
Mass of 40 sets of 10 g for the overseas package
= 40 x 10
= 400 g
Greatest possible mass of the overseas package
= 50 + 400
= 450 g
Answer(s): 450 g