By selling 80 oranges a man gains a cost price of 20 oranges. What is the gain percentage?
To solve this tricky question, let the cost price (CP) of an orange is 1 Rs.
Now CP of 80 oranges = 80 Rs………..(1)
And we know that
Profit= SP (selling price) - CP (cost price)
Here;
Profit = SP of 80 oranges - CP of 80 oranges…….(2)
{Here profit is already given that is CP of 20 oranges }
By (2);
CP of 20 oranges = SP of 80 oranges - CP of 80 oranges
Or
CP of 100 oranges = SP of 80 oranges
Or
SP of 80 oranges = 100 Rs…………(3)
{ cp of 1 orange is 1 Rs.}
Here we have
CP = 80 rs.
SP = 100 rs.
% profit = (SP - CP)*100/CP
% profit = (100–80)*100/80 = 20*100/80 = 25%
So %profit is 25%
