Instead of multiplying a number by 2, the number is divided by 10. What is the percentage of error obtained ?
Choose one
A) 94 % B) 92 % C) 95 % D) 93 % E) 97 %

Rationale: let the number be x the right number is 2 x the wrong number is x / 10 error is ( 2 x - x / 10 ) = 19 x / 10 percentage of error is ( ( 19 x / 10 ) / 2 x ) * 100 = 95 % answer : c
Answer: C