4. Last year 450 hamburgers were sold at the July 4th festival. This year 1,250 hamburgers were sold. What was the percent increase in hamburger sales from
last year to this year, rounded to the nearest percent?

At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?