$14.$ Insert a formula to calculate the monthly estimate as follows:

a$.$ In cell C$6($the blank cell to the right of "Monthly Estimate:"$)$ insert a formula that adds the handling fee amount in cell C$5$ to $500.($Hint: Edit the formula so it does not use a function but does start with an equal sign.$)$

b$.$ Select the Number format that shows currency values with two decimal places.