Please can someone show me the excel and formulas for this problem? Thank you.

5. Tim is 40 years old and would like to establish a retirement plan. Develop a spreadsheet model that could be used to assist Tim with retirement planning. Your model should include the following input parameters Tim's current age -40 Tim's current total retirement savings = $50,000 Annual rate of return on retirement savings = 10% Tim's current annual salary = $85,000 Tim's expected annual percentage increase in salary = 5% Tim's percent of annual salary contributed to retirement = 6% Tim's expected retirement age = 65 Tim's additional annual (tax free) contribution to retirement = $2,000 a) (10 pts) Prepare a spreadsheet indicating the value of the retirement fund on a yearly basis through the retirement age of 65 b) (5 pts) Prepare a 2-way data table when the rate of return on investments varies from 3% to 5% with 0.5% increment. What is the value of retirement for an expected 5% return on investment and a 5% contribution from salary? increment and contribution from salary varies from 5% to 7% with a 1% c) (3 pts) What should be the annual (tax free) contribution if he desires to retire with $850,000 in savings? (use parameters employed in part (a))