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 |
$1.30 |
$0.90
|
Every additional 10 g or part thereof |
$0.45 |
How much did Penelope pay for the postage when she sent a letter which weighed 82 g and 7 postcards to Korea by airmail?
Remaining mass that Penelope had to pay for the letter as it was more than 20 g
= 82 - 20
= 62 g
Number of sets of additional 10 g of the letter that Penelope had to pay for
= 62 ÷ 10
= 6 r 2
Total number of sets of additional 10 g of the letter that Penelope had to pay for
= 6 + 1
= 7
Amount that Penelope had to pay for the sets of additional 10 g of the letter
= 7 x 0.45
= $3.15
Total amount that Penelope had to pay for the letter
= 1.30 + 3.15
= $4.45
Amount that Penelope had to pay for the 7 postcards
= 7 x 0.90
= $6.30
Total amount that Penelope paid
= 4.45 + 6.30
= $10.75
Answer(s): $10.75