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 |
$1.30 |
$0.70
|
Every additional 10 g or part thereof |
$0.45 |
How much did Fiona pay for the postage when she sent a letter which weighed 89 g and 2 postcards to Japan by airmail?
Remaining mass that Fiona 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 Fiona had to pay for
= 69 ÷ 10
= 6 r 9
Total number of sets of additional 10 g of the letter that Fiona had to pay for
= 6 + 1
= 7
Amount that Fiona had to pay for the sets of additional 10 g of the letter
= 7 x 0.45
= $3.15
Total amount that Fiona had to pay for the letter
= 1.30 + 3.15
= $4.45
Amount that Fiona had to pay for the 2 postcards
= 2 x 0.70
= $1.40
Total amount that Fiona paid
= 4.45 + 1.40
= $5.85
Answer(s): $5.85