Find the value of '?' in the equation: (830 + ? × 3 × 14 ÷ 100) − (830 × 14 × 3 ÷ 100) = 20.16.

Explanation

Let's solve the equation step-by-step: (830 + ? × 3 × 14 ÷ 100) − (830 × 14 × 3 ÷ 100) = 20.16. Simplifying, we get 830 + ? × 0.42 − 830 × 0.42 = 20.16. This reduces to ? × 0.42 = 20.16 + 830 × 0.42 − 830. Calculating further, ? × 0.42 = 20.16 + 348.6 − 830 = -461.24. Since this value does not match any given options, the correct choice is 'None of the above'.