212.50
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1062.5
850*(1-.15)=850*.85=722.50
25% of 850 = 0.25 x 850 = 212.50 850 + 212.50 = 1,062.50 So the sofa would be sold for 1,062.50 to earn a 25% profit.
850 - 10% = 850 x (1 - (10/100)) = 850 x 0.9 = 765
Designate the unknown base number as n. Then 0.25 n = 850 or n = 3400. 1 percent of this is 34.