The table shows the airmail rates for sending letters and postcards to some countries.
Destination |
Letters |
Postcards |
|
Mass |
Postage Rate |
Per piece |
Korea, Japan
|
1st 20 g |
$1.50 |
$0.90
|
Every additional 10 g or part thereof |
$0.40 |
How much did Hilda pay for the postage when she sent a letter which weighed 93 g and 9 postcards to Japan by airmail?
Remaining mass that Hilda had to pay for the letter as it was more than 20 g
= 93 - 20
= 73 g
Number of sets of additional 10 g of the letter that Hilda had to pay for
= 73 ÷ 10
= 7 r 3
Total number of sets of additional 10 g of the letter that Hilda had to pay for
= 7 + 1
= 8
Amount that Hilda had to pay for the sets of additional 10 g of the letter
= 8 x 0.40
= $3.20
Total amount that Hilda had to pay for the letter
= 1.50 + 3.20
= $4.70
Amount that Hilda had to pay for the 9 postcards
= 9 x 0.90
= $8.10
Total amount that Hilda paid
= 4.70 + 8.10
= $12.80
Answer(s): $12.80