4. Tanya Tomkins carns $58,000 annually, with raises of 2.5 percent each year. She is 30 years old and plans to retire when she is 65. She also hopes to receive a promotion in 5 years that will raise her salary by 15 perecent at the time of the promotion. Tanya is considering going to school next year to pursue a graduate degree. She will not earn anything over the two years it takes to carn the degree and in fact will have to pay tuition of $15,000 a year. When she graduates she hopes to see an increase in her salary to $70000 a year and to receive raises of 3 percent annually. If Tanya believes 7 percent is a reasonable rate of return, should she go to school to pursue the graduate degree? Explain fully with all supporting calculations clearly presented in Excel and using Excel functions whenever possible.