Berkeley

10 years at 8% (assuming annually compounding interest)
15 years at 10% (assuming annually compounding interest) 20 years at 5% (assuming annually compounding interest)

4. The first term of a geometric sequence is 27 and the fourth term is 64. Find the common ratio.
===5. A theater has 60 seats in the first row, 68 seats in the second row, 76 seats in the third row, and so on in the same increasing pattern. If the theater has 20 rows of seats, how many seats are in the theater?===