A Large Outdoor Amphitheater Has $99$ Rows of Seats With $20$ Seats in the First Row

Essay

A large outdoor amphitheater has $99$ rows of seats with $20$ seats in the first row, $24$ seats in the second, $28$ in the third, and so on. How many seats are in row $47 ?$ How many seats are there in the theater? How many seats total are there in rows $32$ through $64 ?$