The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 80 g |
80¢ |
85¢ |
Every additional 10 g |
35¢ |
40¢ |
Ian paid $3.85 for posting a package overseas. What was the greatest possible mass of the package that Ian posted?
$1 = 100¢
$3.85 = 3.85 x 100 = 385¢
Amount that Ian paid for the additional sets of 10 g for the overseas package
= 385 - 85
= 300¢
Number of sets of 10 g that Ian paid for the overseas package
= 300 ÷ 10
= 30
Mass of 30 sets of 10 g for the overseas package
= 30 x 10
= 300 g
Greatest possible mass of the overseas package
= 80 + 300
= 380 g
Answer(s): 380 g