It's not a percentage of anything on it's own! You'd need to ask; What percent is 850 of [A number]
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850x=407x is the percentage in decimal form.Isolate the x by dividing 407 by 850.407/850 = .4788 => 47.88%407 is the 47.88% of 850.
% rate = 850/578 * 100% = 147.06%
To work out the increase as a percentage: ((850 / 400) -1) *100 = 112.5%
percentage = 59.18%% rate:= 503/850 * 100%= 0.5918 * 100%= 59.18%
35.3% increase.