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It would be best to work out how many seconds in a minute, then multiply by the amount in each subsequent unit:

Number of seconds in a minute is 60

Number of minutes in an hour is 60, so seconds in an hour is 3,600

Number of hours in a day is 24, so seconds in a day is 86,400

Number of days in a year is 365.242199 so seconds in a year is 31,556,925.9936

Number of years in a century is 100, so seconds in a century is 3,155,692,599.36

Or to 3 sig figs, 3.16billion

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13y ago

What else can I help you with?