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	$0.80	$0.70
	Every additional 10 g or part thereof	$0.20

How much did Nicole pay for the postage when she sent a letter which weighed 124 g and 7 postcards to Malaysia by airmail?
Remaining mass that Nicole had to pay for the letter as it was more than 40 g
= 124 - 40
= 84 g

Number of sets of additional 10 g of the letter that Nicole had to pay for 
= 84 ÷ 10
= 8 r 4

Total number of sets of additional 10 g of the letter that Nicole had to pay for 
= 8 + 1
= 9

Amount that Nicole had to pay for the sets of additional 10 g of the letter
= 9 x 0.20
= $1.80

Total amount that Nicole had to pay for the letter
= 0.80 + 1.80
= $2.60

Amount that Nicole had to pay for the 7 postcards
= 7 x 0.70
= $4.90

Total amount that Nicole paid
= 2.60 + 4.90
= $7.50

Answer(s): $7.50