250% OF 90 =
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410
250 - 225 / 250 *100 = 250 - 0.9*100 = 250 - 90 = 160 The answer is exact so percent error is zero.
Go 250 units of distance in any one direction. Turn 90 degrees clockwise and go 250 units of distance in a straight line.Turn 90 degrees clockwise and go 250 units of distance in a straight line.Turn 90 degrees clockwise and go 250 units of distance in a straight line.You will have travelled along a square route whose total distance was 1000 units of distance.Alternatively you could have turned counter clockwise each time.
sell = cost + cost x 250% = cost x 350 % → cost = sell ÷ 350 % = 315 ÷ 350 % = 90
250