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 40 g |
$1.40 |
$0.40
|
Every additional 10 g or part thereof |
$0.30 |
How much did Fanny pay for the postage when she sent a letter which weighed 106 g and 4 postcards to Australia by airmail?
Remaining mass that Fanny had to pay for the letter as it was more than 40 g
= 106 - 40
= 66 g
Number of sets of additional 10 g of the letter that Fanny had to pay for
= 66 ÷ 10
= 6 r 6
Total number of sets of additional 10 g of the letter that Fanny had to pay for
= 6 + 1
= 7
Amount that Fanny had to pay for the sets of additional 10 g of the letter
= 7 x 0.30
= $2.10
Total amount that Fanny had to pay for the letter
= 1.40 + 2.10
= $3.50
Amount that Fanny had to pay for the 4 postcards
= 4 x 0.40
= $1.60
Total amount that Fanny paid
= 3.50 + 1.60
= $5.10
Answer(s): $5.10