Profit after selling a commodity for Rs. 425 is the same as the loss after selling it for Rs. 355.What is the cost of the commodity ?

Suppose that the cost of the item is $Rs x$

Profit after selling a commodity for Rs. 425 is the same as the loss after selling it for Rs. 355

Hence, $425-x=x-355$

Separate the variables

$\begin{array}{rcl}2x& =& 425+355\\ & =& 780\\ x& =& \frac{780}{2}\\ & =& 390\end{array}$

Therefore, the cost of the commodity is $\boxed{\mathbf{R}\mathbf{s}\mathbf{ }\mathbf{390}}$