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	$1.70	$0.70
	Every additional 10 g or part thereof	$0.35

How much did Elyse pay for the postage when she sent a letter which weighed 61 g and 4 postcards to Malaysia by airmail?
Remaining mass that Elyse had to pay for the letter as it was more than 40 g
= 61 - 40
= 21 g

Number of sets of additional 10 g of the letter that Elyse had to pay for 
= 21 ÷ 10
= 2 r 1

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

Amount that Elyse had to pay for the sets of additional 10 g of the letter
= 3 x 0.35
= $1.05

Total amount that Elyse had to pay for the letter
= 1.70 + 1.05
= $2.75

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

Total amount that Elyse paid
= 2.75 + 2.80
= $5.55

Answer(s): $5.55