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 20 g |
$1.30 |
$0.70
|
Every additional 10 g or part thereof |
$0.25 |
How much did Xuan pay for the postage when she sent a letter which weighed 69 g and 5 postcards to Vietnam by airmail?
Remaining mass that Xuan had to pay for the letter as it was more than 20 g
= 69 - 20
= 49 g
Number of sets of additional 10 g of the letter that Xuan had to pay for
= 49 ÷ 10
= 4 r 9
Total number of sets of additional 10 g of the letter that Xuan had to pay for
= 4 + 1
= 5
Amount that Xuan had to pay for the sets of additional 10 g of the letter
= 5 x 0.25
= $1.25
Total amount that Xuan had to pay for the letter
= 1.30 + 1.25
= $2.55
Amount that Xuan had to pay for the 5 postcards
= 5 x 0.70
= $3.50
Total amount that Xuan paid
= 2.55 + 3.50
= $6.05
Answer(s): $6.05