The table shows the airmail rates for sending letters and postcards to some countries.
Destination |
Letters |
Postcards |
|
Mass |
Postage Rate |
Per piece |
Indonesia, Malaysia
|
1st 20 g |
$1.30 |
$0.70
|
Every additional 10 g or part thereof |
$0.20 |
How much did Esther pay for the postage when she sent a letter which weighed 55 g and 8 postcards to Malaysia by airmail?
Remaining mass that Esther had to pay for the letter as it was more than 20 g
= 55 - 20
= 35 g
Number of sets of additional 10 g of the letter that Esther had to pay for
= 35 ÷ 10
= 3 r 5
Total number of sets of additional 10 g of the letter that Esther had to pay for
= 3 + 1
= 4
Amount that Esther had to pay for the sets of additional 10 g of the letter
= 4 x 0.20
= $0.80
Total amount that Esther had to pay for the letter
= 1.30 + 0.80
= $2.10
Amount that Esther had to pay for the 8 postcards
= 8 x 0.70
= $5.60
Total amount that Esther paid
= 2.10 + 5.60
= $7.70
Answer(s): $7.70