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If it was a test you would need to get a score of 80% or more. 80% can be thought of the fraction 80/100 So if you got 80 you got 80 out of a possible 100
Start with good output 54,000 kg the standard yield 80% Calculate the standard input 54000/.80 = 67,500 kilograms
To factorise x3 + 5x2 - 16x - 80 I note that -80 = 5 x -16 and 5 & -16 are the coefficients of x2 and x. Thus I have: x3 + 5x2 - 16x - 80 = (x + 5)(x2 - 16) and the second term is a difference of 2 squares, meaning I have: x3 + 5x2 - 16x - 80 = (x + 5)(x + 4)(x - 4)
80% of 80= 80% * 80= 0.8 * 80= 64
80 80 + —— 160 160 80 + —— 240