The movie studio needs a loan of $200,000,000.00. The lender will give them the loan at 3.36% for a period of 3 years. How much interest will the movie studio have to pay over the 3 years and how much will they have to actually pay back to the lender for borrowing the money?

There are two basic forms of interest - simple interest and compound interest.  

For simple interest the formula is:

I = PRT (interest equals principal, interest rate and time)

The principal is the actual amount of money you borrow or put into a savings account.