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 30 g |
$1.70 |
$0.70
|
Every additional 10 g or part thereof |
$0.20 |
How much did Barbara pay for the postage when she sent a letter which weighed 104 g and 6 postcards to Thailand by airmail?
Remaining mass that Barbara had to pay for the letter as it was more than 30 g
= 104 - 30
= 74 g
Number of sets of additional 10 g of the letter that Barbara had to pay for
= 74 ÷ 10
= 7 r 4
Total number of sets of additional 10 g of the letter that Barbara had to pay for
= 7 + 1
= 8
Amount that Barbara had to pay for the sets of additional 10 g of the letter
= 8 x 0.20
= $1.60
Total amount that Barbara had to pay for the letter
= 1.70 + 1.60
= $3.30
Amount that Barbara had to pay for the 6 postcards
= 6 x 0.70
= $4.20
Total amount that Barbara paid
= 3.30 + 4.20
= $7.50
Answer(s): $7.50