Question

the cost of one pen his 7 rupees then what is the rule for the cost of n pens step by step explanation​

Answer 1

Cost of 1 pen = Rs.7

Then cost of n pens will be ?

Ex :

1 pen = 7

2 pen (n) = ?

2 pen = 7 × 2

2 pen = Rs.14

It will continue the same pattern.

More the pens, more will be the cost, (direct proportion).

Answer 2

cost of one pen = 7 rupees

therefore , cost of n pens = 7×n

= 7n

Ans. is 7n

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