The answer depends on the units for 2100: seconds, days, years or whatever. And since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
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2100/60 = 35 hours
35 minutes.
60 minutes = one hour35 x 60 = 2100 minutes
There are 60 minutes in one hour. Therefore, 3.5 hours is equal to 3.5 x 60 = 210 minutes.
7% of 2100 = 7% * 2100 = 0.07 * 2100 = 147