The table shows the airmail rates for sending letters and postcards to some countries.
Destination |
Letters |
Postcards |
|
Mass |
Postage Rate |
Per piece |
Indonesia, Malaysia
|
1st 40 g |
$1.30 |
$0.80
|
Every additional 10 g or part thereof |
$0.25 |
How much did Sabrina pay for the postage when she sent a letter which weighed 61 g and 3 postcards to Indonesia by airmail?
Remaining mass that Sabrina had to pay for the letter as it was more than 40 g
= 61 - 40
= 21 g
Number of sets of additional 10 g of the letter that Sabrina had to pay for
= 21 ÷ 10
= 2 r 1
Total number of sets of additional 10 g of the letter that Sabrina had to pay for
= 2 + 1
= 3
Amount that Sabrina had to pay for the sets of additional 10 g of the letter
= 3 x 0.25
= $0.75
Total amount that Sabrina had to pay for the letter
= 1.30 + 0.75
= $2.05
Amount that Sabrina had to pay for the 3 postcards
= 3 x 0.80
= $2.40
Total amount that Sabrina paid
= 2.05 + 2.40
= $4.45
Answer(s): $4.45