RRB Group D 8-Dec-2013 Shift 1 Solved Paper

Let the C.P. of the article be x.
S.P. of the article = M.P. - discount $=1920-10\%$ of $1920=1728$
Gain $=8\%$
C.P. $=$ S.P. $\times \frac{100}{108}$
C.P. $=\left(1728\right)\times \frac{100}{108}=1600$
Gain percent if no discount is allowed would be:
Gain $\%=($ Gain $∕\mathit{C}.\mathit{P}.)\times 100$
Gain = M.P. - C.P. $=1920-1600$ $=320$
Gain $\%=\frac{320}{1600}\times 100$
$=20\%$