Find PV of series of cash flows when interest rates are not constant. Find present value given the following information. Erica deposited $2,000 in a savings account that pays 10 percent compound interest per year. At the end of five years, Erica withdraws only the interest on interest. How much docs she withdraw? In 1963, a McDonald's double hamburger cost 28 cents. In 1984, that same hamburger-well, not the same exact hamburger, but one just like it-cost $1 35. What was the annual rate of growth in a McDonald's hamburger's price from 1963 to 1984