100 oranges are bought at the rate of Rs.350 and sold at the rate of Rs. 48 per dozen. The percentage of profit or loss is

\par C.P. of 1 orange = Rs. \left(\frac{350}{100}\right) =  \par Rs. 3.50

\par S.P. of 1 orange = Rs. \left(\frac{48}{12}\right) =  \par Rs. 4

\par Gain\% = \left(\frac{0.50}{3.50}\times 100)\right)\%  = \frac{100}{7}\% = 14\frac{2}{7}\%