Can you please help with the answer and formula to this problem?

Quarrie Industries is analyzing a new project for one of its business lines. Through extensive review, they have gathered the following data:

Initial requirement for equipment: $140,000 Depreciation: Straight-line to zero over the four-year life of the project with no salvage value. The required rate of return: 15% Marginal tax rate: 35%

What is the operating cash flow under the base-case scenario?

$27,000.00

$26,400.00

$31,300.00

$34,300.00

$36,900

\begin{tabular}{|l|r|r|r|} \hline & Worst Case & Base Case & Best Case \\ \hline Sales quantity & 9000 & 12000 & 14500 \\ \hline Sales price per unit & $10.00 & $12.00 & $14.00 \\ \hline Variable cost per unit & $7.00 & $8.00 & $8.50 \\ \hline Fixed cost & $14,000.00 & $16,000.00 & $18,000.00 \\ \hline \end{tabular}