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 |
$1.10 |
$0.70
|
Every additional 10 g or part thereof |
$0.30 |
How much did Rachel pay for the postage when she sent a letter which weighed 92 g and 9 postcards to Thailand by airmail?
Remaining mass that Rachel had to pay for the letter as it was more than 40 g
= 92 - 40
= 52 g
Number of sets of additional 10 g of the letter that Rachel had to pay for
= 52 ÷ 10
= 5 r 2
Total number of sets of additional 10 g of the letter that Rachel had to pay for
= 5 + 1
= 6
Amount that Rachel had to pay for the sets of additional 10 g of the letter
= 6 x 0.30
= $1.80
Total amount that Rachel had to pay for the letter
= 1.10 + 1.80
= $2.90
Amount that Rachel had to pay for the 9 postcards
= 9 x 0.70
= $6.30
Total amount that Rachel paid
= 2.90 + 6.30
= $9.20
Answer(s): $9.20