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 |
$0.50
|
Every additional 10 g or part thereof |
$0.45 |
How much did Eva pay for the postage when she sent a letter which weighed 104 g and 5 postcards to Korea by airmail?
Remaining mass that Eva had to pay for the letter as it was more than 20 g
= 104 - 20
= 84 g
Number of sets of additional 10 g of the letter that Eva had to pay for
= 84 ÷ 10
= 8 r 4
Total number of sets of additional 10 g of the letter that Eva had to pay for
= 8 + 1
= 9
Amount that Eva had to pay for the sets of additional 10 g of the letter
= 9 x 0.45
= $4.05
Total amount that Eva had to pay for the letter
= 1.50 + 4.05
= $5.55
Amount that Eva had to pay for the 5 postcards
= 5 x 0.50
= $2.50
Total amount that Eva paid
= 5.55 + 2.50
= $8.05
Answer(s): $8.05