The pressure difference of the two ends of a small pipe of cross-sectional radius x is given by P = K where K is a constant real number. Use differentials to determine by approximately what percentage the pressure P changes if the radius of the pipe is decreased by 3%. Enter your answer without the percentage sign. Enter an integer or a fully reduced fraction such as 4, -16 , 3/7 , 1/9 etc. No spaces please

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