Compute the Present Value of the Following Single Amounts to Be

Short Answer

Compute the present value of the following single amounts to be received at the end of the specified period at the given interest rate.
$$\begin{array} { l c c c } \text { Item } & \begin{array} { c c c } \text { Invested } \\\text { Amount }\end{array} & \begin{array} { c } \text { Interest } \\\text { Rate }\end{array} & \begin{array} { c } \text { Number } \\\text { of } \\\text { Periods }\end{array} \\\hline\text { a. } & \$ 40,00 & 7 \% & 20 \\\text { b. } & \$ 20,000 & 6 \% & 25 \\\text { c. } & \$ 50,000 & 11 \% & 10\\\end{array}$$