The table shows the airmail rates for sending letters and postcards to some countries.
Destination |
Letters |
Postcards |
|
Mass |
Postage Rate |
Per piece |
Thailand, Vietnam, Myanmar
|
1st 30 g |
$1.10 |
$0.70
|
Every additional 10 g or part thereof |
$0.25 |
How much did Tammy pay for the postage when she sent a letter which weighed 81 g and 7 postcards to Thailand by airmail?
Remaining mass that Tammy had to pay for the letter as it was more than 30 g
= 81 - 30
= 51 g
Number of sets of additional 10 g of the letter that Tammy had to pay for
= 51 ÷ 10
= 5 r 1
Total number of sets of additional 10 g of the letter that Tammy had to pay for
= 5 + 1
= 6
Amount that Tammy had to pay for the sets of additional 10 g of the letter
= 6 x 0.25
= $1.50
Total amount that Tammy had to pay for the letter
= 1.10 + 1.50
= $2.60
Amount that Tammy had to pay for the 7 postcards
= 7 x 0.70
= $4.90
Total amount that Tammy paid
= 2.60 + 4.90
= $7.50
Answer(s): $7.50