Please help me with step by step instrucions on an excel file just as the above mentioned spreadsheet.

1. Create an If function to calculate a total order value based on the following criteria; (6 points) If at least 1000 units are ordered, each unit is charged at a discounted price. Otherwise, each unit is charged the normal price. Enter an appropriate formula in cell E4 for proper order total price calculation. Using the conditional formatting, fill the cells with purple background if the order total exceeds $1000