Use the compound interest formula, A(t)=P(1+nr)nt. An account is opened with an intial deposit of $7,500 and earns 2.8% interest compounded semiannually. Round all answers to the nearest dollar. a. What will the account be worth in 20 years? \$ b. What if the interest were compounding monthly? $ c. What if the interest were compounded daily (assume 365 days in a year)? $