Answers:
What are the factors of 819? 9*91 (there are others, but you want to use this since he needs either 4 or 9 pennies to get the 9¢)
so how do you get 91¢ with 5 coins?
50¢, 25¢, 10¢, 5¢ and 1¢ add up to 91¢
Art has:
9 Pennies - $0.09
9 Nickles - $0.45
9 Dimes - $0.90
9 Quarters - $2.25
9 50 cent pieces - $4.50
=$8.19
Edit: Was that for your homework? If it was you should do it yourself next time.
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