If the coast of banana is increase by 10 RS per dozen, one can get 3 dozen less for 600 RS . Find the original coast of one dozen of bananas.

Answer 1

Let the cost of banana per dozen be Rs.x.
Amount for which bananas are bought=Rs.600
No.of dozens of bananas for Rs.600=600/x
New cost of banana per dozen=Rs.(x+10)
New no.of dozens of bananas for Rs.600=600/x+10
According to given condition,
600/x-600/x+10=3

Now you can solve it and after that find x.

Answer 2

40