The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 80 g |
45¢ |
80¢ |
Every additional 10 g |
20¢ |
35¢ |
Oscar paid $3.60 for posting a package overseas. What was the greatest possible mass of the package that Oscar posted?
$1 = 100¢
$3.60 = 3.60 x 100 = 360¢
Amount that Oscar paid for the additional sets of 10 g for the overseas package
= 360 - 80
= 280¢
Number of sets of 10 g that Oscar paid for the overseas package
= 280 ÷ 10
= 28
Mass of 28 sets of 10 g for the overseas package
= 28 x 10
= 280 g
Greatest possible mass of the overseas package
= 80 + 280
= 360 g
Answer(s): 360 g