The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 50 g |
50¢ |
75¢ |
Every additional 10 g |
20¢ |
30¢ |
Riordan paid $2.40 for posting a package locally. What was the greatest possible mass of the package that Riordan posted?
$1 = 100¢
$2.40 = 2.40 x 100 = 240¢
Amount that Riordan paid for the additional sets of 10 g for the local package
= 240 - 50
= 190¢
Number of sets of 10 g that Riordan paid for the local package
= 190 ÷ 10
= 19
Mass of 19 sets of 10 g for the local package
= 19 x 10
= 190 g
Greatest possible mass of the local package
= 50 + 190
= 240 g
Answer(s): 240 g