The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 60 g |
40¢ |
90¢ |
Every additional 10 g |
15¢ |
40¢ |
Will paid $4.70 for posting a package locally. What was the greatest possible mass of the package that Will posted?
$1 = 100¢
$4.70 = 4.70 x 100 = 470¢
Amount that Will paid for the additional sets of 10 g for the local package
= 470 - 40
= 430¢
Number of sets of 10 g that Will paid for the local package
= 430 ÷ 10
= 43
Mass of 43 sets of 10 g for the local package
= 43 x 10
= 430 g
Greatest possible mass of the local package
= 60 + 430
= 490 g
Answer(s): 490 g