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 |
$1.10 |
$0.80
|
Every additional 10 g or part thereof |
$0.30 |
How much did Jen pay for the postage when she sent a letter which weighed 87 g and 8 postcards to Thailand by airmail?
Remaining mass that Jen had to pay for the letter as it was more than 30 g
= 87 - 30
= 57 g
Number of sets of additional 10 g of the letter that Jen had to pay for
= 57 ÷ 10
= 5 r 7
Total number of sets of additional 10 g of the letter that Jen had to pay for
= 5 + 1
= 6
Amount that Jen had to pay for the sets of additional 10 g of the letter
= 6 x 0.30
= $1.80
Total amount that Jen had to pay for the letter
= 1.10 + 1.80
= $2.90
Amount that Jen had to pay for the 8 postcards
= 8 x 0.80
= $6.40
Total amount that Jen paid
= 2.90 + 6.40
= $9.30
Answer(s): $9.30