The table shows the airmail rates for sending letters and postcards to some countries.

Destination	Letters		Postcards
	Mass	Postage Rate	Per piece
Korea, Japan	1st 20 g	$0.80	$0.70
	Every additional 10 g or part thereof	$0.45

How much did Kylie pay for the postage when she sent a letter which weighed 48 g and 4 postcards to Japan by airmail?
Remaining mass that Kylie had to pay for the letter as it was more than 20 g
= 48 - 20
= 28 g

Number of sets of additional 10 g of the letter that Kylie had to pay for 
= 28 ÷ 10
= 2 r 8

Total number of sets of additional 10 g of the letter that Kylie had to pay for 
= 2 + 1
= 3

Amount that Kylie had to pay for the sets of additional 10 g of the letter
= 3 x 0.45
= $1.35

Total amount that Kylie had to pay for the letter
= 0.80 + 1.35
= $2.15

Amount that Kylie had to pay for the 4 postcards
= 4 x 0.70
= $2.80

Total amount that Kylie paid
= 2.15 + 2.80
= $4.95

Answer(s): $4.95