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 40 g |
$0.90 |
$0.70
|
Every additional 10 g or part thereof |
$0.20 |
How much did Jane pay for the postage when she sent a letter which weighed 121 g and 5 postcards to Thailand by airmail?
Remaining mass that Jane had to pay for the letter as it was more than 40 g
= 121 - 40
= 81 g
Number of sets of additional 10 g of the letter that Jane had to pay for
= 81 ÷ 10
= 8 r 1
Total number of sets of additional 10 g of the letter that Jane had to pay for
= 8 + 1
= 9
Amount that Jane had to pay for the sets of additional 10 g of the letter
= 9 x 0.20
= $1.80
Total amount that Jane had to pay for the letter
= 0.90 + 1.80
= $2.70
Amount that Jane had to pay for the 5 postcards
= 5 x 0.70
= $3.50
Total amount that Jane paid
= 2.70 + 3.50
= $6.20
Answer(s): $6.20