A business owner is trying to determine the break-even point. The owner uses the revenue function R⁡(x)=−0.012⁢x^2+800⁢x The cost function includes an initial investment of $⁢5,000 , along with $⁢550 per unit. Write a linear cost function where x is the number of units sold, and use the functions to find the larger number of units the company can sell to break even. Round to the nearest thousand. Enter your answer in the box.