Three hundred oranges were bought at Rs.40 per dozen and sold at a profit of Rs.25. The selling price of the oranges per dozen is

The correct option is B Rs. 41
Let the selling price of the oranges per dozen $=x$

profit for selling one dozen oranges $=S.P-C.P=(x-40)$

$300$ oranges $=25$ dozen orange

profit for $25$ dozen $=25(x-40)$

$25=25(x-40)$

$1=x-40$

$x=41$