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WBCS Preliminary Examination 2017 — General Studies · Question 158 of 200

Q158
ArithmeticPercentage, Profit & Loss
Due to some error in the weighing machine, Aahana's weight was shown as 72 kg as against the actual value of 80 kg. The percentage error is
  1. a.9%
  2. b.8%
  3. c.10%
  4. d.None of the above

Answer: (C) 10%

The error is $80-72=8$ kg; as a percentage of the actual (true) value, $\dfrac{8}{80}\times100\% = 10\%$.

Q157 Whole paperQ159
Due to some error in the weighing machine, Aahana's weight was show… — WBCS Preliminary Examination 2017 Q158 | Prostuti360°