Need Help with the following in finance

You have a $50,000 salary and you save 5% a month. What is your monthly savings and how much will you save each year, ignoring the monthly compounding?

For the above problem, assume you save the same dollar amount each year for 10 years and invest the savings at 4%. How much will you have at the end of the 10 years?

How much would you have to save each year and invest at 4% for the next 20 years to have $100,000 at the end of the 20 years? How about if the rate is 6%?

Your friend has a defined benefit plan and expects to retire at age 58 after 35 years of work, and the expected pension will be $40,000 a year. Your job has a 401k. Assume you also want to retire in 35 years, and want to be able to draw down $40,000 per year for the folllowing 30 years ( yes, there is a risk that you live past the age of 88). How much will you need to have amassed in order to generate the $40,000 income stream? How much will you have to save each year, for the next 35 years? Assume an investment rate of 5%?

What is the difference between a defined benefit and defined contribution plan?

What is your net worth if you have $75,000 in assets and $45,000 in liabilities?

Do student loans count towards your liabilities?

If your employer contributes to your 401k, is there any penalty for you?

If your employer has a 50% matching policy, and you contribute $15,000 to your 401k, how much will you actually have?