The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 90 g |
50¢ |
65¢ |
Every additional 10 g |
20¢ |
25¢ |
Oliver paid $1.80 for posting a package locally. What was the greatest possible mass of the package that Oliver posted?
$1 = 100¢
$1.80 = 1.80 x 100 = 180¢
Amount that Oliver paid for the additional sets of 10 g for the local package
= 180 - 50
= 130¢
Number of sets of 10 g that Oliver paid for the local package
= 130 ÷ 10
= 13
Mass of 13 sets of 10 g for the local package
= 13 x 10
= 130 g
Greatest possible mass of the local package
= 90 + 130
= 220 g
Answer(s): 220 g