A company has a production cost function  Cx=300+1.2x{“versi…

A company has a production cost function  Cx=300+1.2x{“version”:”1.1″,”math”:”Cx=300+1.2x”}  and a revenue function Rx=6x-0.001×2, {“version”:”1.1″,”math”:”Rx=6x-0.001×2, ”} when  x{“version”:”1.1″,”math”:”x”}  units are sold.   Find the number of units that produces maximum profit.   The number of units is:  (rounded to the nearest whole number)