For a drug, the first price reduction is 10%, and the second price reduction is 20%. Now the price of the drug is () A. 70%B. 60%C. 72%D. 64%

For a drug, the first price reduction is 10%, and the second price reduction is 20%. Now the price of the drug is () A. 70%B. 60%C. 72%D. 64%

1 × (1-10%) × (1-20%), = 0.9 × 0.8, = 72%; therefore, C

If the price of a drug is reduced to 40 yuan after 20% price increase, then its price before price increase is 40 yuan

Should I add something to this question? What's the percentage of price reduction!
Suppose: the price before price increase is x, y is the price after price increase, and the percentage of price decrease is Z
X（1+20%）=Y
Y（1-Z%）=40
So there is a percentage difference in price reduction

The price of tape recorders will be reduced by 35%, and then by 20%?

Suppose that the original price is x, and it becomes 0.65x after the first price reduction, and (1-0.2) 0.65x = 0.52x for the second price reduction, which is 52% of the original price