Single equivalent discount on successive discounts of 10% and
20%=(10+20−
20×10
100
)%=28%
Single equivalent discount on successive discounts of 28% and 40%=(28+40−
28×40
100
)% =56.8% Thus, the value of a single discount that is equivalent to a series of discounts of 10%, 20% and 40% is 56.8% Trick : Required single discount