Answer:

the cost of 12 pen is 12 rs

cost of 7 ball is 56 rs

then the cost of 1 ball is 8 rs

and the cost of 1 pen is 1 rs

then the ratio is 8:1

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dozen mean set of 12 items.

Step-by-step explanation:

• dozen means set of 12 items
• cost of dozen (12) pen =12 rupees
• therefore cost one pen =[tex]\frac{12}{12} =1[/tex]
• cost of 7 ball pen = 56 rupees
• therefore cost of 1 ball pen=[tex]\frac{56}{7} =8[/tex]
• now ratio of cost of a pen to cost of ball pen= 1:8.