Answer:
48%
Step-by-step explanation:
With the first mark down of 40%, relative to the original price (P), the price has reduced to
P * (1-40%) = 0.6P.
With the additional 20% off the item, the price will therefore reduce to
0.6P * (1-20%)
=0.6P * 80%
= 0.48P = 48% of the Original Price.
Therefore, a customer will end up paying 48% of the Original Price.