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A student multiplied a number by 4/5 instead of 5/4. What is the percentage error in the calculation?1). 162). 253). 364). 20

Answer»

LET the number MULTIPLIED be x

EXPECTED answer = 5/4 × x = 1.25x

Answer obtained with wrong calculation = 4/5 × x = 0.8x

Error = (Expected answer – Wrong answer) / (Expected answer) × 100

⇒ (1.25x – 0.8x) / (1.25x) × 100

∴ 0.45/1.25 × 100 = 36%



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