Designate the unknown base number as n. Then 0.25 n = 850 or n = 3400. 1 percent of this is 34.
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850*(1-.15)=850*.85=722.50
25 25 is equal to 1/4 1/2 is 50%
0.25 as a decimal - or 25/100 as a fraction (which simplifies to 1/4)
because 1 fourth of 100% is 25%
850 - 10% = 850 x (1 - (10/100)) = 850 x 0.9 = 765