The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 60 g |
45¢ |
90¢ |
Every additional 10 g |
15¢ |
35¢ |
John paid $2.25 for posting a package locally. What was the greatest possible mass of the package that John posted?
$1 = 100¢
$2.25 = 2.25 x 100 = 225¢
Amount that John paid for the additional sets of 10 g for the local package
= 225 - 45
= 180¢
Number of sets of 10 g that John paid for the local package
= 180 ÷ 10
= 18
Mass of 18 sets of 10 g for the local package
= 18 x 10
= 180 g
Greatest possible mass of the local package
= 60 + 180
= 240 g
Answer(s): 240 g