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 20 g |
$0.80 |
$0.70
|
Every additional 10 g or part thereof |
$0.30 |
How much did Nicole pay for the postage when she sent a letter which weighed 78 g and 5 postcards to Thailand by airmail?
Remaining mass that Nicole had to pay for the letter as it was more than 20 g
= 78 - 20
= 58 g
Number of sets of additional 10 g of the letter that Nicole had to pay for
= 58 ÷ 10
= 5 r 8
Total number of sets of additional 10 g of the letter that Nicole had to pay for
= 5 + 1
= 6
Amount that Nicole had to pay for the sets of additional 10 g of the letter
= 6 x 0.30
= $1.80
Total amount that Nicole had to pay for the letter
= 0.80 + 1.80
= $2.60
Amount that Nicole had to pay for the 5 postcards
= 5 x 0.70
= $3.50
Total amount that Nicole paid
= 2.60 + 3.50
= $6.10
Answer(s): $6.10