Finance

I'm trying to understand the formula necessary to get the answers, which is $330.74 Problem: Buying a car. A student borrowed $4000 from a credit union toward purchasing a car. The interest rate on such a loan is 14% compounded quarterly, with payments due every quarter. The student wants to pay off the loan in 4 years. Find the quarterly payment.

Calculating the future value of a fund.

An employee gets paid at the end of each month and $60 is withheld from her paycheck for a retirement fund. The fund pays 1% per month (equivalent to 12% annually compounded monthly). What amount will be in the fund at the end of 30 months?

What is 3/4 raised to the power of infinity?

Find the sum: infinity on top of the sigma sign, with i=1 under the sigma and 8(3/4)^(i-1) on the right hand side of the sigma.

Finance

I've tried many difference formulas and I can't seem to get the answer $119,431.77 Problem: How much should Mr. Graff pay for a gold mine expected to yield an annual return of $20,000 and to have a life expectancy of 20 years, if he wants to have a 15% annual return on his investment and he can set up a sinking fund that earns 10% a year?

Calculating the future value of a savings account.

Mr. & Mrs. Corey are newlyweds and want to purchase a home, but they need a down payment of $10,000. If they want to buy their home in 2 years, how much should they save each month in their savings account that pays 3% per annum compounded monthly?