The Marginal Revenue of an Item sold is $ \ R(x)= 100 e^{-0.001 x} \ $ dollers .
Find the total revenue by selling items $ \ 101 \ $ through $ \ 1000 \ $.
Answer:
I think this would be the integral $ \ \int_{101}^{1000} R(x) \ dx \ \ $
But I am not sure .
Help me