What is the percentage change in the result when we add 50 to a certain number x, instead of subtracting 50 from the same number x?

A. 50%

B. 75%

C. 100%

D. 300%

E. Can't be determined

Answer: Option E

Solution(By Examveda Team)

If we take different values of x then,
Let x = 150, then error%
$$\eqalign{ & = \frac{{ {\frac{{ {200 - 100} }}{{100}}} }}{{100}} \cr & = 100\% \cr} $$
Again if x = 100, then error%
$$\eqalign{ & = \frac{{ {\left( {150 - 50} \right) \times 100} }}{{100}} \cr & = 200\% \cr} $$
If we take different value of x,
we get different answer so we can't determine it.