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 |
$1.10 |
$0.60
|
Every additional 10 g or part thereof |
$0.30 |
How much did Diana pay for the postage when she sent a letter which weighed 116 g and 2 postcards to Indonesia by airmail?
Remaining mass that Diana had to pay for the letter as it was more than 40 g
= 116 - 40
= 76 g
Number of sets of additional 10 g of the letter that Diana had to pay for
= 76 ÷ 10
= 7 r 6
Total number of sets of additional 10 g of the letter that Diana had to pay for
= 7 + 1
= 8
Amount that Diana had to pay for the sets of additional 10 g of the letter
= 8 x 0.30
= $2.40
Total amount that Diana had to pay for the letter
= 1.10 + 2.40
= $3.50
Amount that Diana had to pay for the 2 postcards
= 2 x 0.60
= $1.20
Total amount that Diana paid
= 3.50 + 1.20
= $4.70
Answer(s): $4.70