1) A certain radio costs a merchant $72, which includes overhead and selling expenses. At what price must he sell it if he is to make a profit of 20% on the selling price?

a) $86.40 b) $90 c) $92 d)$144
e)none of these answers

2) Daniel gave 4/5 of his stickers to Javier. Javier's collection of stickers increased to 64. If Javier had 28 stickers in the beginning, how many stickers did Daniel have in the beginning?

Please help and thank you in advance.

1 answer

profit = .2 S
cost = 72

72 + .2 s = s

72 = .8 s

s = 90
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Javier had J = 28

28 + (4/5) D = 64

(4/5) D = 36

D = 45