Estimate the order of number of seconds in a century.

Answer

9

Explanation

1 century = 100 years
`= 100xx365xx24xx60xx60s`
`=3.65xx2.4xx3.6xx10^8s`
`= 3.1536 xx10^9s`
As 3.1536 lt 5, therefore order of number of
seconds in a century =9