Thor invests $750 in an account, with interest compounded continuously. If his investment doubles in value after 9 years, how much money will he have after 12 years?

I think the answer would be somewhere around $1999.9995 because but im not good with interest rates but 9 and 12 have a common denominator of 3 then I divided by 100 to get. 3 and times 1500 to get 499.9995 then added that to 1500.

9,000 that will be you answer or if is double will be 18,000