Cell B1 contains the number 150. In Cell B2, enter a nested if function that will do the following: If cell A1 is less than 20, then multiply it by 1. If it is greater than or equal to 20 but less than 50, then multiply it by 2. If its is greater than or equal to 50 and less than 100, then multiply it by 3. If it is great or equal to than 100, then multiply it by 4.