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 |
$0.30 |
How much did Xuan pay for the postage when she sent a letter which weighed 75 g and 4 postcards to Thailand by airmail?
Remaining mass that Xuan had to pay for the letter as it was more than 40 g
= 75 - 40
= 35 g
Number of sets of additional 10 g of the letter that Xuan had to pay for
= 35 ÷ 10
= 3 r 5
Total number of sets of additional 10 g of the letter that Xuan had to pay for
= 3 + 1
= 4
Amount that Xuan had to pay for the sets of additional 10 g of the letter
= 4 x 0.30
= $1.20
Total amount that Xuan had to pay for the letter
= 1.30 + 1.20
= $2.50
Amount that Xuan had to pay for the 4 postcards
= 4 x 0.80
= $3.20
Total amount that Xuan paid
= 2.50 + 3.20
= $5.70
Answer(s): $5.70