A fruit seller bought 240 bananas at the rate of Rs. 48 per dozen. He sells half of them at the rate of Rs. 5 per banana.$frac{1}{6}$ th of the remaining are found to be rotten. The price per banana at which he has to sell the remaining bananas to get a profit of 25% on his entire investment is

Total C.P. $=frac{240 imes 48}{12}=$ Rs. 960

SP for a gain of $25 \%=frac{960 imes 125}{100}=$ Rs. 1200

Amount received on half of bananas at Rs. 5 per

banana = 120 × 5 = Rs. 600

Remaining bananas $=120 imes frac{5}{6}=100$

S.P. of these 100 bananas = Rs. 600

∴ Rate = Rs. 6 per banana