## integration problem

The production of crude oil(in million barrels) from a country X each year is given by $f(t)=35.8e^0.0182t$ with t=0 referring to the production in the year 1990. If the total supply of crude oil from the ground in 1990 was 2500 million barrels, estimate when the supply of crude oil from country X will be depleted.

Thanks, I don't quite understand this question, I would be thankful if you can help me with this.