Calculate the number of times a human heari beats in the life of 100 years old man. Time of one heart beat = 0.8s

Explanation

Life of the man = 100 years
100 years includes 76 normal years and 24 leap years
Total no of days = `76 xx 365 + 24 xx 366 = 36524` days
Number of seconds = `36524 xx 24 xx 3600 = 3.155 xx 10^(9)` second
Number of heart beats = `("Total no of seconds")/("Time period of heart beat") = (3.155 xx 10^(9))/(0.8s) = 3.94 xx 10^(9)`