The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 40 g |
70¢ |
85¢ |
Every additional 10 g |
30¢ |
40¢ |
Mark paid $2.50 for posting a package locally. What was the greatest possible mass of the package that Mark posted?
$1 = 100¢
$2.50 = 2.50 x 100 = 250¢
Amount that Mark paid for the additional sets of 10 g for the local package
= 250 - 70
= 180¢
Number of sets of 10 g that Mark paid for the local package
= 180 ÷ 10
= 18
Mass of 18 sets of 10 g for the local package
= 18 x 10
= 180 g
Greatest possible mass of the local package
= 40 + 180
= 220 g
Answer(s): 220 g