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 |
$1.10 |
$0.50
|
Every additional 10 g or part thereof |
$0.45 |
How much did Winnie pay for the postage when she sent a letter which weighed 86 g and 7 postcards to Korea by airmail?
Remaining mass that Winnie had to pay for the letter as it was more than 20 g
= 86 - 20
= 66 g
Number of sets of additional 10 g of the letter that Winnie had to pay for
= 66 ÷ 10
= 6 r 6
Total number of sets of additional 10 g of the letter that Winnie had to pay for
= 6 + 1
= 7
Amount that Winnie had to pay for the sets of additional 10 g of the letter
= 7 x 0.45
= $3.15
Total amount that Winnie had to pay for the letter
= 1.10 + 3.15
= $4.25
Amount that Winnie had to pay for the 7 postcards
= 7 x 0.50
= $3.50
Total amount that Winnie paid
= 4.25 + 3.50
= $7.75
Answer(s): $7.75