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¢ |
Owen paid $3.80 for posting a package locally. What was the greatest possible mass of the package that Owen posted?
$1 = 100¢
$3.80 = 3.80 x 100 = 380¢
Amount that Owen paid for the additional sets of 10 g for the local package
= 380 - 70
= 310¢
Number of sets of 10 g that Owen paid for the local package
= 310 ÷ 10
= 31
Mass of 31 sets of 10 g for the local package
= 31 x 10
= 310 g
Greatest possible mass of the local package
= 90 + 310
= 400 g
Answer(s): 400 g