Question

A person sold his watch for 144 and gain is equal to cp then cost of watch

Answer 1

Answer:

Rs.80

Step-by-step explanation:

Let, CP = x Rs.  

Percentage-profit = x %,  

SO,  

selling-price = x + x*x/100 = 144,  

OR,  

x^2 +100x -14400 = 0, ==> (x-80)(x+180) = 0,  

x = 80, &, x = -180,  

Hence,  

Cost-Price = Rs. 80 >======================< ANSWER