Explain how to calculate simple interest. Choose the correct answer below.
O A. Multiply the principal by the interest rate (expressed as a decimal) and then multiply by the time
OB. Multiply the principal by the interest rate (expressed as a decimal)
O c. Multiply the principal by the interest rate (expressed as a decimal). Then multiply by the time. Finally, add the result to the original principal
OD. Take the interest rate (expressed as a percent), drop the % symbol, and then multiply by the principal and the time