A chair is sold for Rs.825. gain is 10%. find C.P.

\par S.P. = 825         \par gain = 10\%

\par C.P. = 825 \times \frac{100}{100 + 10}                                                            \par \lbrack C.P. \par = S.P.  \times \frac{100}{100 + gain\%}\rbrack

825 \times \frac{100}{110} = 750

\therefore \par C.P.  = 750