Problem $3.$ Peach Co$.$ provides free term life insurance to its employees. The insurance comes in $$1,000$ units. Thus, an individual's life insurance is equivalent to one year's earnings rounded down to the nearest $$1,000$ of their salary. The insurance's cost is a function of each employee's age, as indicated in the spreadsheet.

a$)$ Use the ROUNDDOWN function to calculate the number of life insurance units for each employee based on the employee's salary in Column D$.$

b$)$ In Column E$,$ utilize the HLOOKUP function to find the cost of one unit of this insurance based on the employee's age.

c$)$ Compute the total cost of providing this insurance to each employee in Column F$.$

For example, Joe is $38$ years old with a base salary of $$65,700.$ He would be entitled to $65$ units at the cost of $$10\mathrm{.}53$ per unit $($based on the table provided in the spreadsheet$),$ and the total cost for the company is $65**10\mathrm{.}53=$$$684\mathrm{.}45$