Oil is leaking from a tanker at the rate of LaTeX: R(t)=2000e^{-0.2t} R ( t ) = 2000 e − 0 . 2 t gallons per hour, where LaTeX: t t is measured in hours. What is the amount of oil that has leaked out after LaTeX: 10 10 hours, to the closest LaTeX: 10 10 -gallons?