1. Question 1 Write an Excel formula in cell Orders
Question 1 Write an Excel formula in cell Orders!D2, which can be copied down the column to determine the corresponding computer name based on the product number in the Inventory worksheet. If the product number does not exist in the inventory, display the word, “INVALID”.
=IFERROR(VLOOKUP(C2,Inventory!A$3:B$14,2,
FALSE),"INVALID")

2. Question 2 Write an Excel formula in cell Orders
Question 2 Write an Excel formula in cell Orders!G2, which can be copied down the column, to determine the corresponding computer cost based on the product number in the Inventory worksheet. (Assume all clients will purchase the computer and the associated upgrades.) If the product number does not exist in the inventory, display the word, “INVALID”.
=IFERROR(VLOOKUP(C2,Inventory!A$3:C$14,3,FALSE) + VLOOKUP(C2,Inventory!A$3:D$14,4,FALSE),"INVALID")
Instead of using IFERROR you can check for the word INVALID in cell Orders!D2

3. Question 3 Write an Excel formula in cell Orders
Question 3 Write an Excel formula in cell Orders!H2, which can be copied down the column, to determine the warranty cost of the computer based on the warranty type (if chosen) and the cost of the computer. If the product number does not exist in the inventory, display a 0 in the cell. (Use the named range Warranty in your formula.) Note: If the customer chooses to purchase a warranty, they can only select one of the options.
=IFERROR(IF(E2,HLOOKUP(G2,Warranty,2,TRUE),
IF(F2,HLOOKUP(G2,Warranty,3,TRUE),0)),0)
Instead of using IFERROR you can check for the word INVALID in cells Orders!D2 or Orders!G2.

4. Question 4 Write an Excel formula in cell Orders
Question 4 Write an Excel formula in cell Orders!I2, which can be copied down, to determine the total cost of the purchase. (Total Computer Cost + Warranty)
=SUM(G2:H2)