The table shows the airmail rates for sending letters and postcards to some countries.
Destination |
Letters |
Postcards |
|
Mass |
Postage Rate |
Per piece |
Indonesia, Malaysia
|
1st 30 g |
$1.40 |
$0.60
|
Every additional 10 g or part thereof |
$0.30 |
How much did Jen pay for the postage when she sent a letter which weighed 84 g and 9 postcards to Indonesia by airmail?
Remaining mass that Jen had to pay for the letter as it was more than 30 g
= 84 - 30
= 54 g
Number of sets of additional 10 g of the letter that Jen had to pay for
= 54 ÷ 10
= 5 r 4
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
= 1.40 + 1.80
= $3.20
Amount that Jen had to pay for the 9 postcards
= 9 x 0.60
= $5.40
Total amount that Jen paid
= 3.20 + 5.40
= $8.60
Answer(s): $8.60