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 |
$1.20 |
$0.70
|
Every additional 10 g or part thereof |
$0.40 |
How much did Elyse pay for the postage when she sent a letter which weighed 51 g and 4 postcards to Vietnam by airmail?
Remaining mass that Elyse had to pay for the letter as it was more than 20 g
= 51 - 20
= 31 g
Number of sets of additional 10 g of the letter that Elyse had to pay for
= 31 ÷ 10
= 3 r 1
Total number of sets of additional 10 g of the letter that Elyse had to pay for
= 3 + 1
= 4
Amount that Elyse had to pay for the sets of additional 10 g of the letter
= 4 x 0.40
= $1.60
Total amount that Elyse had to pay for the letter
= 1.20 + 1.60
= $2.80
Amount that Elyse had to pay for the 4 postcards
= 4 x 0.70
= $2.80
Total amount that Elyse paid
= 2.80 + 2.80
= $5.60
Answer(s): $5.60