If 500 balls cost $60,calculate

Question

(1)1 ball cost (2)800 balls cost (3)n ball cost

Answer 1

1)$60/500 balls=$0.12/ball
2)800 balls x $0.12/ball=
3) n balls x $0.12/ball=
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Answer 2

1 ball cost is 0.12
800 ball cost 96
N ball cost is nill