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 30 g |
$1.10 |
$0.80
|
Every additional 10 g or part thereof |
$0.25 |
How much did Abi pay for the postage when she sent a letter which weighed 76 g and 9 postcards to Australia by airmail?
Remaining mass that Abi had to pay for the letter as it was more than 30 g
= 76 - 30
= 46 g
Number of sets of additional 10 g of the letter that Abi had to pay for
= 46 ÷ 10
= 4 r 6
Total number of sets of additional 10 g of the letter that Abi had to pay for
= 4 + 1
= 5
Amount that Abi had to pay for the sets of additional 10 g of the letter
= 5 x 0.25
= $1.25
Total amount that Abi had to pay for the letter
= 1.10 + 1.25
= $2.35
Amount that Abi had to pay for the 9 postcards
= 9 x 0.80
= $7.20
Total amount that Abi paid
= 2.35 + 7.20
= $9.55
Answer(s): $9.55