The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 50 g |
75¢ |
80¢ |
Every additional 10 g |
30¢ |
35¢ |
Peter paid $3.05 for posting a package locally. What was the greatest possible mass of the package that Peter posted?
$1 = 100¢
$3.05 = 3.05 x 100 = 305¢
Amount that Peter paid for the additional sets of 10 g for the local package
= 305 - 75
= 230¢
Number of sets of 10 g that Peter paid for the local package
= 230 ÷ 10
= 23
Mass of 23 sets of 10 g for the local package
= 23 x 10
= 230 g
Greatest possible mass of the local package
= 50 + 230
= 280 g
Answer(s): 280 g