Making profit

If I make a profit of 25% on selling a bottle of drink for 85, how much did I buy the drink?

Correct answer:

x =  68

Step-by-step explanation:

r=100%+25%=1+10025=1.25  x r=85 x 1.25=85  1.25x=85  x=1.2585=68  x=68

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