The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 80 g |
75¢ |
95¢ |
Every additional 10 g |
30¢ |
45¢ |
Peter paid $5.45 for posting a package locally. What was the greatest possible mass of the package that Peter posted?
$1 = 100¢
$5.45 = 5.45 x 100 = 545¢
Amount that Peter paid for the additional sets of 10 g for the local package
= 545 - 75
= 470¢
Number of sets of 10 g that Peter paid for the local package
= 470 ÷ 10
= 47
Mass of 47 sets of 10 g for the local package
= 47 x 10
= 470 g
Greatest possible mass of the local package
= 80 + 470
= 550 g
Answer(s): 550 g