Step 1: Mass percent formula.
Mass percent = \( \frac{\text{Mass of solute}}{\text{Mass of solution}} \times 100 \).
Step 2: Calculation.
\[
\frac{\text{Mass of solute}}{200} \times 100 = 10 \quad \Rightarrow \quad \text{Mass of solute} = 20 \, g
\]
Step 3: Conclusion.
Therefore, glucose present =
20 g.