Answer
5400 chirps/hour
129 600 chirps/day
47 304 000 chirps/year
Work Step by Step
60 minutes in 1 hour
90 x 60 = 5400 chirps/hour
24 hours in 1 day
5400 x 24 = 129 600 chirps/day
365 days in 1 year
129 600 x 365 = 47 304 000 chirps/year