The table shows the airmail rates for sending letters and postcards to some countries.
Destination |
Letters |
Postcards |
|
Mass |
Postage Rate |
Per piece |
Korea, Japan
|
1st 20 g |
$1.10 |
$0.80
|
Every additional 10 g or part thereof |
$0.25 |
How much did Tiffany pay for the postage when she sent a letter which weighed 81 g and 3 postcards to Japan by airmail?
Remaining mass that Tiffany had to pay for the letter as it was more than 20 g
= 81 - 20
= 61 g
Number of sets of additional 10 g of the letter that Tiffany had to pay for
= 61 ÷ 10
= 6 r 1
Total number of sets of additional 10 g of the letter that Tiffany had to pay for
= 6 + 1
= 7
Amount that Tiffany had to pay for the sets of additional 10 g of the letter
= 7 x 0.25
= $1.75
Total amount that Tiffany had to pay for the letter
= 1.10 + 1.75
= $2.85
Amount that Tiffany had to pay for the 3 postcards
= 3 x 0.80
= $2.40
Total amount that Tiffany paid
= 2.85 + 2.40
= $5.25
Answer(s): $5.25