Question

by selling a book for rupees 119 the profit percentage is same as the cost price in rupees find the cost price of the book​

Answer 1

Answer:

Step-by-step explanation:

Let the cp = Rs x

SP= Rs 119

Profit % = (Profit / CP )× 100

Here profit =SP-,CP

profit = 119 - x

So profit. %= (119-x)/x × 100

As per question profit %=CP

Hence

(119-x)/x × 100 = x

(11900 - 100x)/x = x

x^2+100x - 11900 = 0

Solving the quadratic eq by factorising

x^2 +170x -70x -11900=0

x(x+170) -70(x+170)=0

(x+170) (x-70)=0

x= -170, x =70

Rejecting x=-170

CP = Rs 70

Hope it is clear

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Answer 2

Answer:

19

Step-by-step explanation: