A invests Rs.4800 in scheme S which offers simple interest at x % per annum for 8 years. After 8 years, he received the interest amount is 300% more than the investment amount, then find the value of x?

Using the simple interest formula I = (P * R * T) / 100, the interest received is 300% more than the principal of 4800, meaning the interest is 4 times 4800 which equals 19200. Setting up the equation gives 19200 = (4800 * x * 8) / 100, which simplifies to 19200 = 384 * x. Solving for x gives x = 50, which is not listed among the provided numerical choices. Therefore, the correct choice is None of these.

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