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 30 g	$1.30	$0.60
	Every additional 10 g or part thereof	$0.40

How much did Nicole pay for the postage when she sent a letter which weighed 113 g and 4 postcards to Malaysia by airmail?
Remaining mass that Nicole had to pay for the letter as it was more than 30 g
= 113 - 30
= 83 g

Number of sets of additional 10 g of the letter that Nicole had to pay for 
= 83 ÷ 10
= 8 r 3

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 0.40
= $3.60

Total amount that Nicole had to pay for the letter
= 1.30 + 3.60
= $4.90

Amount that Nicole had to pay for the 4 postcards
= 4 x 0.60
= $2.40

Total amount that Nicole paid
= 4.90 + 2.40
= $7.30

Answer(s): $7.30