Explanation : 1 wind fan C.P. in 1st shop = Rs 1/4 and 1 wind
fan C.P. in 2nd shop = Rs 1/5
On mixing these 2 wind fans, the cost price of these
2 will be = 1/4 + 1/5 = Rs 9/20
So, C.P. of 1 wind fan = (9/20)/2 = Rs 9/40.
Actual price at which 1 wind fan is sold after combining = Rs 1/4
S.P. – C.P. = 1/4 - 9/40 = 1/40 = Tt is positive; so it is profit