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 40 g	$1.50	$0.70
	Every additional 10 g or part thereof	$0.45

How much did Xandra pay for the postage when she sent a letter which weighed 69 g and 8 postcards to Japan by airmail?
Remaining mass that Xandra had to pay for the letter as it was more than 40 g
= 69 - 40
= 29 g

Number of sets of additional 10 g of the letter that Xandra had to pay for 
= 29 ÷ 10
= 2 r 9

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

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

Total amount that Xandra had to pay for the letter
= 1.50 + 1.35
= $2.85

Amount that Xandra had to pay for the 8 postcards
= 8 x 0.70
= $5.60

Total amount that Xandra paid
= 2.85 + 5.60
= $8.45

Answer(s): $8.45