The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 40 g |
50¢ |
80¢ |
Every additional 10 g |
20¢ |
30¢ |
Pierre paid $4.30 for posting a package locally. What was the greatest possible mass of the package that Pierre posted?
$1 = 100¢
$4.30 = 4.30 x 100 = 430¢
Amount that Pierre paid for the additional sets of 10 g for the local package
= 430 - 50
= 380¢
Number of sets of 10 g that Pierre paid for the local package
= 380 ÷ 10
= 38
Mass of 38 sets of 10 g for the local package
= 38 x 10
= 380 g
Greatest possible mass of the local package
= 40 + 380
= 420 g
Answer(s): 420 g