The table shows the airmail rates for sending letters and postcards to some countries.
Destination |
Letters |
Postcards |
|
Mass |
Postage Rate |
Per piece |
Korea, Japan
|
1st 20 g |
$1.50 |
$0.70
|
Every additional 10 g or part thereof |
$0.25 |
How much did Jean pay for the postage when she sent a letter which weighed 87 g and 8 postcards to Japan by airmail?
Remaining mass that Jean had to pay for the letter as it was more than 20 g
= 87 - 20
= 67 g
Number of sets of additional 10 g of the letter that Jean had to pay for
= 67 ÷ 10
= 6 r 7
Total number of sets of additional 10 g of the letter that Jean had to pay for
= 6 + 1
= 7
Amount that Jean had to pay for the sets of additional 10 g of the letter
= 7 x 0.25
= $1.75
Total amount that Jean had to pay for the letter
= 1.50 + 1.75
= $3.25
Amount that Jean had to pay for the 8 postcards
= 8 x 0.70
= $5.60
Total amount that Jean paid
= 3.25 + 5.60
= $8.85
Answer(s): $8.85