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 |
$1.50 |
$0.60
|
Every additional 10 g or part thereof |
$0.30 |
How much did Zara pay for the postage when she sent a letter which weighed 104 g and 7 postcards to Malaysia by airmail?
Remaining mass that Zara had to pay for the letter as it was more than 20 g
= 104 - 20
= 84 g
Number of sets of additional 10 g of the letter that Zara had to pay for
= 84 ÷ 10
= 8 r 4
Total number of sets of additional 10 g of the letter that Zara had to pay for
= 8 + 1
= 9
Amount that Zara had to pay for the sets of additional 10 g of the letter
= 9 x 0.30
= $2.70
Total amount that Zara had to pay for the letter
= 1.50 + 2.70
= $4.20
Amount that Zara had to pay for the 7 postcards
= 7 x 0.60
= $4.20
Total amount that Zara paid
= 4.20 + 4.20
= $8.40
Answer(s): $8.40