A) \[66\frac{2}{3}%\]
B) 87.5%
C) 90%
D) 80%
Correct Answer: B
Solution :
Let the number be x Actual calculation = \[\left( \frac{4}{5}+\frac{2}{3} \right)x=\frac{12+10}{15}x\] calculation (by error) \[\left( \frac{5}{4}+\frac{3}{2} \right)x=\frac{11}{4}x\] % error = \[\frac{\frac{11}{4}x-\frac{22}{15}x}{\frac{22}{15}x}\times 100\] = \[\frac{\frac{165-88}{60}}{\frac{22}{15}}\times 100=\frac{77}{60}\times \frac{15}{22}\times 100\] = 87.5%You need to login to perform this action.
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