The total number of tickets for an event sold after t days of advertising is approximately 5(r) = 20.00 + 2.10: + 1.02:2 0.02:3 where 0 S t S 30. After how many days is the point of diminishing returns for this advertising campaign? Give your answer to the nearest hundredth, as in 12.34. How many tickets will have been sold by that time? It is okay for this to be fractional, since 5' is only an approximation. Give your answer to the nearest hundredth, as in 12.34