Wheat plus and minus

If the price of wheat is increased by 20% today, at what percent should it be decreased tomorrow, so as to bring down the price back to the original?

Correct answer:

p =  16.6667 %

Step-by-step explanation:

r1=100%+20%=1+10020=1.2  r1 r2 = 1  r2=1/r1=1/1.2=650.8333  r2 = 1p/100  p=100 (1r2)=100 (10.8333)=16.6667%

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