A shopkeeper expects a gain of \(\frac{45}{2}\) % on his C.P. If his sale was Rs. 392, then find his profit.

We Know,

\(S.P. = \frac{100 + gain \: percent}{100} \times C.P.\)

⇒ \(C.P. = \frac{100}{122.50} \times 392\)

= 320

Profit = 392 − 320 = Rs. 72