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 20 g |
$1.20 |
$0.80
|
Every additional 10 g or part thereof |
$0.45 |
How much did Marion pay for the postage when she sent a letter which weighed 89 g and 7 postcards to Thailand by airmail?
Remaining mass that Marion had to pay for the letter as it was more than 20 g
= 89 - 20
= 69 g
Number of sets of additional 10 g of the letter that Marion had to pay for
= 69 ÷ 10
= 6 r 9
Total number of sets of additional 10 g of the letter that Marion had to pay for
= 6 + 1
= 7
Amount that Marion had to pay for the sets of additional 10 g of the letter
= 7 x 0.45
= $3.15
Total amount that Marion had to pay for the letter
= 1.20 + 3.15
= $4.35
Amount that Marion had to pay for the 7 postcards
= 7 x 0.80
= $5.60
Total amount that Marion paid
= 4.35 + 5.60
= $9.95
Answer(s): $9.95