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 30 g |
$1.50 |
$0.50
|
Every additional 10 g or part thereof |
$0.20 |
How much did Risa pay for the postage when she sent a letter which weighed 96 g and 9 postcards to Malaysia by airmail?
Remaining mass that Risa had to pay for the letter as it was more than 30 g
= 96 - 30
= 66 g
Number of sets of additional 10 g of the letter that Risa had to pay for
= 66 ÷ 10
= 6 r 6
Total number of sets of additional 10 g of the letter that Risa had to pay for
= 6 + 1
= 7
Amount that Risa had to pay for the sets of additional 10 g of the letter
= 7 x 0.20
= $1.40
Total amount that Risa had to pay for the letter
= 1.50 + 1.40
= $2.90
Amount that Risa had to pay for the 9 postcards
= 9 x 0.50
= $4.50
Total amount that Risa paid
= 2.90 + 4.50
= $7.40
Answer(s): $7.40