On selling 17 balls at $ 720, there is a loss equal to the

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On selling 17 balls at $ 720, there is a loss equal to the cost price of 5 balls. The cost price (in $) of a ball is

Let C.P. of a ball = y
S.P. of 17 balls = $ 720
From the question ,
∴ 17y – 720 = 5y
⇒ 17y - 5y = 720
⇒ 12y = 720
⇒ y = $ 60