Understand the expression

We need to calculate the sum of two percentage values: $15\%$ of $800$ and $20\%$ of $400$.

$\text{Expression} = 15\% \text{ of } 800 + 20\% \text{ of } 400$

Evaluate the first term

Convert $15\%$ to a fraction or decimal and multiply by $800$: $\frac{15}{100} \times 800 = 15 \times 8 = 120$.

$15\% \text{ of } 800 = \frac{15}{100} \times 800 = 120$

Evaluate the second term

Convert $20\%$ to a fraction or decimal and multiply by $400$: $\frac{20}{100} \times 400 = 20 \times 4 = 80$.

$20\% \text{ of } 400 = \frac{20}{100} \times 400 = 80$

Add both terms and match options

Sum the results of both terms: $120 + 80 = 200$. This matches Option A.

$120 + 80 = 200$