Single discount from three

Find a single discount equivalent to successive discounts of 10%, 20%, and then 20%.

Correct answer:

p =  42.4 %

Step-by-step explanation:

p1=100%10%=110010=0.9 p2=100%20%=110020=0.8 p3=p2=0.8=54  r=p1 p2 p3=0.9 0.8 0.8=12572=0.576  p=100 (1r)=100 (10.576)=42.4%



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