Question

By selling a toy for Rs. 119, the shopkeeper gained as much percent as its cost.

calculate the cost price of the toy?​

Answer 1

Answer:

Rs. 70

Step-by-step explanation:

Let us say that the Gain% and C.P. = x.

Then, Gain = 119 - x

Gain % = (119 - x)/x × 100 = x

(119 - x)/x × 100 = x

x^2 = 100(119 - x)

x^2 = 11900 - 100x

x^2 + 100x - 11900 = 0

x = 70 [Using Quadratic Formula]

Look the formula up on internet. It is very long to write.