For the cost function c=0.6q2 + 3.6q+6, how fast does c change with respect to q when q=20? Determine the percentage rate of change of c with respect to q when q = 20. How fast does c change with respect to q when q = 20? per unit (Type an integer or a decimal.) The percentage rate of change of c with respect to q when q = 20 is (Type an integer or decimal rounded to two decimal places as needed.) minal art functin