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 |
$1.30 |
$0.60
|
Every additional 10 g or part thereof |
$0.45 |
How much did Kathy pay for the postage when she sent a letter which weighed 66 g and 2 postcards to Myanmar by airmail?
Remaining mass that Kathy had to pay for the letter as it was more than 30 g
= 66 - 30
= 36 g
Number of sets of additional 10 g of the letter that Kathy had to pay for
= 36 ÷ 10
= 3 r 6
Total number of sets of additional 10 g of the letter that Kathy had to pay for
= 3 + 1
= 4
Amount that Kathy had to pay for the sets of additional 10 g of the letter
= 4 x 0.45
= $1.80
Total amount that Kathy had to pay for the letter
= 1.30 + 1.80
= $3.10
Amount that Kathy had to pay for the 2 postcards
= 2 x 0.60
= $1.20
Total amount that Kathy paid
= 3.10 + 1.20
= $4.30
Answer(s): $4.30