$7.$ In cell E$13,$ enter an IF function that tests whether the value in cell D$13$ is equal to an empty text string. If true, return an empty text string. If false, apply the VLOOKUP function to return the name of the product ID entered into cell D$13.8.$ In cell F$13,$ enter another IF function that tests whether the value in cell D$13$ is equal to an empty text string. If true, return an empty text string. If false, return the price of the product ID entered in cell D$13.9.$ In cell H$13,$ enter another IF function to test whether the value in cell D$13$ is equal to an empty text string. If true, return an empty text string; otherwise, calculate the value of the price of the item multiplied by the number of items ordered.