The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 60 g |
45¢ |
80¢ |
Every additional 10 g |
15¢ |
30¢ |
Riordan paid $5.35 for posting a package locally. What was the greatest possible mass of the package that Riordan posted?
$1 = 100¢
$5.35 = 5.35 x 100 = 535¢
Amount that Riordan paid for the additional sets of 10 g for the local package
= 535 - 45
= 490¢
Number of sets of 10 g that Riordan paid for the local package
= 490 ÷ 10
= 49
Mass of 49 sets of 10 g for the local package
= 49 x 10
= 490 g
Greatest possible mass of the local package
= 60 + 490
= 550 g
Answer(s): 550 g