If C.P = Rs 200, S.P = Rs 150, Loss% =.......... .

Given: C.P = Rs 200 and S.P = Rs 150

To find:  We have to find the loss percentage.

Solution: 

Cost price of mobile (CP) = ₹ 200  

Selling price of mobile (SP) = ₹ 150

Now,

Loss = CP $-$ SP

Loss = ₹ 200 $-$ ₹ 150

Loss = ₹ 50

So,

 

$ \ Loss\ \%\ =\ \frac{Loss}{CP} \ \times \ 100\ \ \%\ $

$\ Loss\ \%\ =\ \frac{50}{200} \ \times \ 100\ \ \%\ $

$\ Loss\ \%\ =\ \frac{50}{2} \ \ \%\  = 25\%$.