Devon is young and has just graduated college with her associate$$s degree. She plans to start saving money

for retirement as soon as she starts her new job. By taking $10\%$ of her monthly gross income, Devon is able

to contribute $($a$)$ $$\_\_\_\_\_\_\_\_\_\_$ each month to a retirement plan. The account is expected to earn

interest with an APR of $6\mathrm{.}25\%$ compounded monthly. Round answers to two decimal places.

a$.$ How much money will be in Devon$$s retirement account if she continues to make the same monthly

investment for $40$ years? $(3$ pt$)$

b$.$ Overall, Devon contributed how much of her own money into the retirement account? $(4$ pt$)$

c$.$ What percent of the final balance in Devon$$s retirement account was interest? $(4$ pt