Think of a number. Double the number. Add 200. Divide the answer by 4. Subtract one-half the original number. What is the value of the result?
Let $x$ be the number we think of.  We double $x$ to obtain $2x$, add 200 to find $2x+200$, divide by $4$ to find  \[
\frac{2x+200}{4}=\frac{2x}{4}+\frac{200}{4}=\frac{x}{2}+50.
\] After subtracting one-half of the original number, we are left with $\boxed{50}$.