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 |
$1.10 |
$0.80
|
Every additional 10 g or part thereof |
$0.20 |
How much did Barbara pay for the postage when she sent a letter which weighed 97 g and 9 postcards to Myanmar by airmail?
Remaining mass that Barbara had to pay for the letter as it was more than 40 g
= 97 - 40
= 57 g
Number of sets of additional 10 g of the letter that Barbara had to pay for
= 57 ÷ 10
= 5 r 7
Total number of sets of additional 10 g of the letter that Barbara had to pay for
= 5 + 1
= 6
Amount that Barbara had to pay for the sets of additional 10 g of the letter
= 6 x 0.20
= $1.20
Total amount that Barbara had to pay for the letter
= 1.10 + 1.20
= $2.30
Amount that Barbara had to pay for the 9 postcards
= 9 x 0.80
= $7.20
Total amount that Barbara paid
= 2.30 + 7.20
= $9.50
Answer(s): $9.50