The table shows the airmail rates for sending letters and postcards to some countries.
Destination |
Letters |
Postcards |
|
Mass |
Postage Rate |
Per piece |
New Zealand, Australia
|
1st 20 g |
$1.50 |
$0.50
|
Every additional 10 g or part thereof |
$0.40 |
How much did Xylia pay for the postage when she sent a letter which weighed 99 g and 3 postcards to New Zealand by airmail?
Remaining mass that Xylia had to pay for the letter as it was more than 20 g
= 99 - 20
= 79 g
Number of sets of additional 10 g of the letter that Xylia had to pay for
= 79 ÷ 10
= 7 r 9
Total number of sets of additional 10 g of the letter that Xylia had to pay for
= 7 + 1
= 8
Amount that Xylia had to pay for the sets of additional 10 g of the letter
= 8 x 0.40
= $3.20
Total amount that Xylia had to pay for the letter
= 1.50 + 3.20
= $4.70
Amount that Xylia had to pay for the 3 postcards
= 3 x 0.50
= $1.50
Total amount that Xylia paid
= 4.70 + 1.50
= $6.20
Answer(s): $6.20