1.

The cost of one pen is Rs. 7, then what is the rule for the cost of ‘n’ pens ?

Answer»

Cost of one pen = Rs. 7 = 1 × 7 

Cost of two pens = Rs. 7 + Rs. 7 = 2 × 7 

Cost of three pens = Rs. 7 + Rs. 7 + Rs. 7 = 3 × 7 

…………………………………….. 

Cost of n pens = Rs. 7 + Rs. 7 + Rs. 7 ….. 

n times = 7 × n 

Rule for cost n pens = 7.n.



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