Ben and jim are selling some pens. if ben sells 60 pens per day and jim sells 15 pens per day. ben will have 24 pens left when jim has sold all his pens. if jim sells 60 pens per day and ben sells 15 pens per day, ben will have 204 pens left when jim has sold all his pens.
(a)How many pens does ben have?
(b)If the pens are sold at 4 for $10, how much money will they earn after selling all their pens?

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