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 |
$0.90 |
$0.90
|
Every additional 10 g or part thereof |
$0.45 |
How much did Kylie pay for the postage when she sent a letter which weighed 72 g and 4 postcards to Thailand by airmail?
Remaining mass that Kylie had to pay for the letter as it was more than 30 g
= 72 - 30
= 42 g
Number of sets of additional 10 g of the letter that Kylie had to pay for
= 42 ÷ 10
= 4 r 2
Total number of sets of additional 10 g of the letter that Kylie had to pay for
= 4 + 1
= 5
Amount that Kylie had to pay for the sets of additional 10 g of the letter
= 5 x 0.45
= $2.25
Total amount that Kylie had to pay for the letter
= 0.90 + 2.25
= $3.15
Amount that Kylie had to pay for the 4 postcards
= 4 x 0.90
= $3.60
Total amount that Kylie paid
= 3.15 + 3.60
= $6.75
Answer(s): $6.75