The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 70 g |
55¢ |
75¢ |
Every additional 10 g |
25¢ |
30¢ |
Zeph paid $3.05 for posting a package locally. What was the greatest possible mass of the package that Zeph posted?
$1 = 100¢
$3.05 = 3.05 x 100 = 305¢
Amount that Zeph paid for the additional sets of 10 g for the local package
= 305 - 55
= 250¢
Number of sets of 10 g that Zeph paid for the local package
= 250 ÷ 10
= 25
Mass of 25 sets of 10 g for the local package
= 25 x 10
= 250 g
Greatest possible mass of the local package
= 70 + 250
= 320 g
Answer(s): 320 g