Let the cost price be Rs.100.
(2/3)rd of original SP = 100-20% of 100 = Rs.80
Original SP = ((80*3)/2) = Rs.120
%profit = ((120-100)/100)*100 = 20%
**Quicker Formula:**
% profit or loss = [((100-20)/(2/3))-100]% profit or loss according to +ve or negative sign.
= (80/(2/3))-100 = 20% profit. |