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 |
$1.70 |
$0.80
|
Every additional 10 g or part thereof |
$0.40 |
How much did Shannon pay for the postage when she sent a letter which weighed 55 g and 2 postcards to Indonesia by airmail?
Remaining mass that Shannon had to pay for the letter as it was more than 30 g
= 55 - 30
= 25 g
Number of sets of additional 10 g of the letter that Shannon had to pay for
= 25 ÷ 10
= 2 r 5
Total number of sets of additional 10 g of the letter that Shannon had to pay for
= 2 + 1
= 3
Amount that Shannon had to pay for the sets of additional 10 g of the letter
= 3 x 0.40
= $1.20
Total amount that Shannon had to pay for the letter
= 1.70 + 1.20
= $2.90
Amount that Shannon had to pay for the 2 postcards
= 2 x 0.80
= $1.60
Total amount that Shannon paid
= 2.90 + 1.60
= $4.50
Answer(s): $4.50