The correct answer is: B. Sales – Operating expenses
Net cash inflow of a project is the difference between the cash inflows and cash outflows of a project. Cash inflows are the money that a project generates, such as from sales or investments. Cash outflows are the money that a project spends, such as on expenses or debt repayment.
Option A is incorrect because it includes interest and tax. Interest is a cost of financing a project, and tax is a government levy on income. These are not cash inflows from the project.
Option C is incorrect because it includes net profit after tax. Net profit after tax is the profit that a project makes after accounting for all expenses, including interest and tax. This is not the same as cash inflow, which is the money that a project actually receives.
Option D is incorrect because it includes gross profit. Gross profit is the revenue that a project generates minus the cost of goods sold. This is not the same as cash inflow, which is the money that a project actually receives.
In conclusion, the correct formula for net cash inflow of a project is:
Net cash inflow = Sales – Operating expenses