The table shows the airmail rates for sending letters and postcards to some countries.
Destination |
Letters |
Postcards |
|
Mass |
Postage Rate |
Per piece |
Thailand, Vietnam, Myanmar
|
1st 20 g |
$1.10 |
$0.80
|
Every additional 10 g or part thereof |
$0.40 |
How much did Tiffany pay for the postage when she sent a letter which weighed 73 g and 4 postcards to Vietnam by airmail?
Remaining mass that Tiffany had to pay for the letter as it was more than 20 g
= 73 - 20
= 53 g
Number of sets of additional 10 g of the letter that Tiffany had to pay for
= 53 ÷ 10
= 5 r 3
Total number of sets of additional 10 g of the letter that Tiffany had to pay for
= 5 + 1
= 6
Amount that Tiffany had to pay for the sets of additional 10 g of the letter
= 6 x 0.40
= $2.40
Total amount that Tiffany had to pay for the letter
= 1.10 + 2.40
= $3.50
Amount that Tiffany had to pay for the 4 postcards
= 4 x 0.80
= $3.20
Total amount that Tiffany paid
= 3.50 + 3.20
= $6.70
Answer(s): $6.70