Cost of a dozen pens is Rs 180 and cost of 8 ball pens is Rs 56. Find the ratio of the cost of a pen to the cost of a ball pen.

**Answer:**

Cost of dozen pens = Rs 180

Cost of 1 pen = Rs 15

Cost of 8 ball pens = Rs 56

Cost of 1 ball pen = Rs 7

Ratio of the cost of 1 pen to the cost of 1 ball pen