4. Write an Excel formula in cell Customers!I5 to be copied down to determine the Base price for the specific model home the first customer has purchased. When copied down, the formula will determine the total value of each home for the corresponding customer. (Do not use an IF function for this formula.)

B2 \begin{tabular}{c|c|c} \hline & A & B \\ \hline 1 & Unit Conversion and Plot Details \\ \hline \end{tabular} 2 \begin{tabular}{|l|l|l|l|l} Models & Base & Units & Customers \end{tabular} 2 4 D Models Base Units Customers + B2 \begin{tabular}{c|c|c} \hline & A & B \\ \hline 1 & Unit Conversion and Plot Details \\ \hline \end{tabular} 2 \begin{tabular}{|l|l|l|l|l} Models & Base & Units & Customers \end{tabular} 2 4 D Models Base Units Customers +