Answer:
Normal year 2838240000 beats Leap year 2846016000 beats
Explanation:
60- per minute
60 x 60 = 3600 beats - 1 h
3600 x 24 = 86400 beats -24h
Normal year
86400 x 365 = 31536000 beats - 1 year
31536000 x 90 = 2838240000 beats- 90 years
Leap year
86400 x 366 = 31622400 beats- 1 year
31622400 x 90 =2846016000 beats- 90years