content area top Part 1 Explain how to calculate simple interest. Question content area bottom Part 1 Choose the correct answer below. A. Multiply the principal by the interest rate (expressed as a decimal) and then multiply by the time. B. Multiply the principal by the interest rate (expressed as a decimal). C. Take the interest rate (expressed as a percent), drop the % symbol, and then multiply by the principal and the time. D. Multiply the principal by the interest rate (expressed as a decimal). Then multiply by the time. Finally, add the result to the original principal