In cell F14, enter Total as the label. In the range F15:F20, calculate the total cost of each equip-ment item by entering formulas that return the value of the number of units ordered multiplied by the cost per unit. 12. In cell E22, enter Subtotal as the label, and then in cell F22, use the SUM function to calculate the sum of the values in the range F15:F20. 13. In cell E13, enter Tax Rate as the label, and then in cell F13, enter 3% as the value. 14. In cell E23, enter Est. Tax as the label, and then in cell F23, calculate the estimated tax by enter-ing a formula that multiplies the subtotal