The marginal cost of drilling an oil well depends on the depth at which you are drilling; drilling becomes more expensive, per meter, as you dig deeper into the earth. The fixed costs are1,000,000riyals (the riyal is the unit of currency of Saudi Arabia), and, ifxis the depth in meters, the marginal costs are C(x)=4000+14xriyals/meter.

Find the total cost of drilling a400-meter well.