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 40 g |
$1.30 |
$0.80
|
Every additional 10 g or part thereof |
$0.20 |
How much did Gabby pay for the postage when she sent a letter which weighed 124 g and 7 postcards to Thailand by airmail?
Remaining mass that Gabby had to pay for the letter as it was more than 40 g
= 124 - 40
= 84 g
Number of sets of additional 10 g of the letter that Gabby had to pay for
= 84 ÷ 10
= 8 r 4
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
= 1.30 + 1.80
= $3.10
Amount that Gabby had to pay for the 7 postcards
= 7 x 0.80
= $5.60
Total amount that Gabby paid
= 3.10 + 5.60
= $8.70
Answer(s): $8.70