The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 90 g |
70¢ |
90¢ |
Every additional 10 g |
30¢ |
40¢ |
Warren paid $4.20 for posting a package locally. What was the greatest possible mass of the package that Warren posted?
$1 = 100¢
$4.20 = 4.20 x 100 = 420¢
Amount that Warren paid for the additional sets of 10 g for the local package
= 420 - 70
= 350¢
Number of sets of 10 g that Warren paid for the local package
= 350 ÷ 10
= 35
Mass of 35 sets of 10 g for the local package
= 35 x 10
= 350 g
Greatest possible mass of the local package
= 90 + 350
= 440 g
Answer(s): 440 g