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 |
$1.40 |
$0.80
|
Every additional 10 g or part thereof |
$0.45 |
How much did Wendy pay for the postage when she sent a letter which weighed 84 g and 3 postcards to Thailand by airmail?
Remaining mass that Wendy had to pay for the letter as it was more than 30 g
= 84 - 30
= 54 g
Number of sets of additional 10 g of the letter that Wendy had to pay for
= 54 ÷ 10
= 5 r 4
Total number of sets of additional 10 g of the letter that Wendy had to pay for
= 5 + 1
= 6
Amount that Wendy had to pay for the sets of additional 10 g of the letter
= 6 x 0.45
= $2.70
Total amount that Wendy had to pay for the letter
= 1.40 + 2.70
= $4.10
Amount that Wendy had to pay for the 3 postcards
= 3 x 0.80
= $2.40
Total amount that Wendy paid
= 4.10 + 2.40
= $6.50
Answer(s): $6.50