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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) Can’t be determined

Answer: d
Explanain : 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, then we get different answer so we can’t determine it.

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