How would I calculate APR for a loan without using my calculator?

What would the APR calculation be for the following loan: Amount Borrowed: $200,000 Rate: 7.75% Term: 360 months Monthly payment: $1443.39 I need a formula that I can use with any calculator or in excel. Thanks, Mike

percentage calculation with negative and positive numbers

I need to know the answer and formula for the following in 2003 the store had a negative sale day of -$873 in 2004 the same store had a positive result of $2680 what is the percent of increase from the negative to the positve

Future value for continuous compounding

A promissory note will pay $30,000 at maturity 10 years from now. How much should you be willing to pay for the note now if money is worth 7% compounded continuously?

Compounded interest: exponential and logarithms

How many years (to two decimal places) will it take $5,000 to grow to $7,500 if it is invested at 8% compounded semiannually? Compounded continuously?

investment: continuous compounding

The parents of a newborn child want to have $60,000 for the child's college education 17 years from now. At what rate of interest compounded continuously (to three decimal places) must a grandparent's gift of $20,000 be invested now to achieve this goal?