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 |
$1.60 |
$0.40
|
Every additional 10 g or part thereof |
$0.25 |
How much did Cindy pay for the postage when she sent a letter which weighed 52 g and 2 postcards to Vietnam by airmail?
Remaining mass that Cindy had to pay for the letter as it was more than 30 g
= 52 - 30
= 22 g
Number of sets of additional 10 g of the letter that Cindy had to pay for
= 22 ÷ 10
= 2 r 2
Total number of sets of additional 10 g of the letter that Cindy had to pay for
= 2 + 1
= 3
Amount that Cindy had to pay for the sets of additional 10 g of the letter
= 3 x 0.25
= $0.75
Total amount that Cindy had to pay for the letter
= 1.60 + 0.75
= $2.35
Amount that Cindy had to pay for the 2 postcards
= 2 x 0.40
= $0.80
Total amount that Cindy paid
= 2.35 + 0.80
= $3.15
Answer(s): $3.15