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 |
$1.60 |
$0.70
|
Every additional 10 g or part thereof |
$0.25 |
How much did Zara pay for the postage when she sent a letter which weighed 41 g and 9 postcards to Malaysia by airmail?
Remaining mass that Zara had to pay for the letter as it was more than 20 g
= 41 - 20
= 21 g
Number of sets of additional 10 g of the letter that Zara had to pay for
= 21 ÷ 10
= 2 r 1
Total number of sets of additional 10 g of the letter that Zara had to pay for
= 2 + 1
= 3
Amount that Zara had to pay for the sets of additional 10 g of the letter
= 3 x 0.25
= $0.75
Total amount that Zara had to pay for the letter
= 1.60 + 0.75
= $2.35
Amount that Zara had to pay for the 9 postcards
= 9 x 0.70
= $6.30
Total amount that Zara paid
= 2.35 + 6.30
= $8.65
Answer(s): $8.65