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 |
$0.90 |
$0.70
|
Every additional 10 g or part thereof |
$0.20 |
How much did Cindy pay for the postage when she sent a letter which weighed 45 g and 3 postcards to Thailand by airmail?
Remaining mass that Cindy had to pay for the letter as it was more than 20 g
= 45 - 20
= 25 g
Number of sets of additional 10 g of the letter that Cindy had to pay for
= 25 ÷ 10
= 2 r 5
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 0.20
= $0.60
Total amount that Cindy had to pay for the letter
= 0.90 + 0.60
= $1.50
Amount that Cindy had to pay for the 3 postcards
= 3 x 0.70
= $2.10
Total amount that Cindy paid
= 1.50 + 2.10
= $3.60
Answer(s): $3.60