1. **State the problem:** We are given the total revenue function $$R = 3x^2 + 2000x$$ where $$R$$ is in thousands of Ksh and $$x$$ is the number of units sold in thousands. 2. **Understand the function:** This is a quadratic function representing revenue based on units sold. 3. **Interpret the terms:** The term $$3x^2$$ shows revenue increasing quadratically with units sold, and $$2000x$$ shows a linear increase. 4. **Example evaluation:** To find revenue for a specific number of units, substitute $$x$$ with that value. For example, if $$x=1$$ (1000 units), then $$R = 3(1)^2 + 2000(1) = 3 + 2000 = 2003$$ thousand Ksh. 5. **Summary:** The function $$R = 3x^2 + 2000x$$ models total revenue in thousands of Ksh based on units sold in thousands.