The table shows the prices of wafers at two shops. The wafers are only sold in sets of 7 wafers in Shiyun's Bakery or sets of 8 wafers in Gabby's Bakery.

Shop	Price of wafers
Shiyun's Bakery	7 for $13
Gabby's Bakery	8 for $16

1. Emily has $42.10. She wants to buy 32 wafers from Gabby's Bakery. How much more money does she need to buy the 32 wafers?
2. Justin has $84. He wants to buy the greatest possible number of wafers with his money from one of the two shops. What is the greatest possible number of wafers he can buy with his money?

(a)
Number of sets of 8 wafers
= 32 ÷ 8
= 4

Cost of 32 wafers 
= 4 x 16
= $64

Amount that Emily needs more to buy the 32 wafers
= 64 - 42.10
= $21.90

(b)
Number of sets of 7 wafers that Justin could buy at Shiyun's Bakery
= 84 ÷ 13
= 6 r 6

Number of wafers that Justin could buy at Shiyun's Bakery
= 6 x 7
= 42 (More)

Number of sets of 8 wafers that Justin could buy at Gabby's Bakery
= 84 ÷ 16
= 5 r 4

Number of wafers that Justin could buy at Gabby's Bakery
= 5 x 8
= 40

Greatest possible number of wafers that Justin can buy with his money = 42

Answer(s): (a) $21.90; (b) 42