A fruit seller bought 25 dozen bananas at Rs.12 per dozen. He sold 10 dozen bananas at Rs.15 per dozen and 12 dozen at Rs.10 per dozen. At what rate did he sell the rest of the bananas if he gained Rs.24 on the whole transaction?

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Solution

CP of 25 dozen bananas $= R s .12$ per dozen
CP of 300 bananas=Rs.300

Profit on whole transaction $= R s .24$
Therefore Total selling price $= 300 + 24 = R s .324$

SP of 10 dozen bananas=Rs 15 per dozen.
SP of 120 bananas=Rs.180

SP of 12 dozen bananas=Rs.10 per dozen
SP of 144 bananas=Rs.120

Remaining bananas=300-(120+144)=36=3 dozen
The SP of these bananas must be Rs.324-(180+120)=Rs.24
Therefore SP of each dozen of remaining banana must be $R s . \frac{24}{3} = R s .8$

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