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 |
$1.60 |
$0.70
|
Every additional 10 g or part thereof |
$0.20 |
How much did Gabby pay for the postage when she sent a letter which weighed 103 g and 9 postcards to Japan by airmail?
Remaining mass that Gabby had to pay for the letter as it was more than 20 g
= 103 - 20
= 83 g
Number of sets of additional 10 g of the letter that Gabby had to pay for
= 83 ÷ 10
= 8 r 3
Total number of sets of additional 10 g of the letter that Gabby had to pay for
= 8 + 1
= 9
Amount that Gabby had to pay for the sets of additional 10 g of the letter
= 9 x 0.20
= $1.80
Total amount that Gabby had to pay for the letter
= 1.60 + 1.80
= $3.40
Amount that Gabby had to pay for the 9 postcards
= 9 x 0.70
= $6.30
Total amount that Gabby paid
= 3.40 + 6.30
= $9.70
Answer(s): $9.70