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 30 g	$1.50	$0.90
	Every additional 10 g or part thereof	$0.35

How much did Jade pay for the postage when she sent a letter which weighed 89 g and 8 postcards to Korea by airmail?
Remaining mass that Jade had to pay for the letter as it was more than 30 g
= 89 - 30
= 59 g

Number of sets of additional 10 g of the letter that Jade had to pay for 
= 59 ÷ 10
= 5 r 9

Total number of sets of additional 10 g of the letter that Jade had to pay for 
= 5 + 1
= 6

Amount that Jade had to pay for the sets of additional 10 g of the letter
= 6 x 0.35
= $2.10

Total amount that Jade had to pay for the letter
= 1.50 + 2.10
= $3.60

Amount that Jade had to pay for the 8 postcards
= 8 x 0.90
= $7.20

Total amount that Jade paid
= 3.60 + 7.20
= $10.80

Answer(s): $10.80