The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 70 g |
55¢ |
60¢ |
Every additional 10 g |
20¢ |
25¢ |
Mark paid $3.85 for posting a package locally. What was the greatest possible mass of the package that Mark posted?
$1 = 100¢
$3.85 = 3.85 x 100 = 385¢
Amount that Mark paid for the additional sets of 10 g for the local package
= 385 - 55
= 330¢
Number of sets of 10 g that Mark paid for the local package
= 330 ÷ 10
= 33
Mass of 33 sets of 10 g for the local package
= 33 x 10
= 330 g
Greatest possible mass of the local package
= 70 + 330
= 400 g
Answer(s): 400 g