The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 50 g |
80¢ |
90¢ |
Every additional 10 g |
35¢ |
40¢ |
Ryan paid $4.70 for posting a package overseas. What was the greatest possible mass of the package that Ryan posted?
$1 = 100¢
$4.70 = 4.70 x 100 = 470¢
Amount that Ryan paid for the additional sets of 10 g for the overseas package
= 470 - 90
= 380¢
Number of sets of 10 g that Ryan paid for the overseas package
= 380 ÷ 10
= 38
Mass of 38 sets of 10 g for the overseas package
= 38 x 10
= 380 g
Greatest possible mass of the overseas package
= 50 + 380
= 430 g
Answer(s): 430 g