1. Stating the problem: A is greater than B by 10%, and B is greater than C by 20%. Given C = 20, find A. 2. Important formulas and rules: - If A is greater than B by p%, then $A = B \times (1 + \frac{p}{100})$. - We will use this formula twice: first to find B from C, then A from B. 3. Find B from C: Since B is greater than C by 20%, $$B = C \times (1 + \frac{20}{100}) = 20 \times 1.20 = 24$$ 4. Find A from B: Since A is greater than B by 10%, $$A = B \times (1 + \frac{10}{100}) = 24 \times 1.10 = 26.4$$ 5. Final answer: $$\boxed{A = 26.4}$$