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 30 g |
$1.10 |
$0.50
|
Every additional 10 g or part thereof |
$0.20 |
How much did Esther pay for the postage when she sent a letter which weighed 62 g and 9 postcards to Australia by airmail?
Remaining mass that Esther had to pay for the letter as it was more than 30 g
= 62 - 30
= 32 g
Number of sets of additional 10 g of the letter that Esther had to pay for
= 32 ÷ 10
= 3 r 2
Total number of sets of additional 10 g of the letter that Esther had to pay for
= 3 + 1
= 4
Amount that Esther had to pay for the sets of additional 10 g of the letter
= 4 x 0.20
= $0.80
Total amount that Esther had to pay for the letter
= 1.10 + 0.80
= $1.90
Amount that Esther had to pay for the 9 postcards
= 9 x 0.50
= $4.50
Total amount that Esther paid
= 1.90 + 4.50
= $6.40
Answer(s): $6.40