Following Question:

For the equations below, q is the total number of units produced per day by m employees of a manufacturer, and p is the price per unit at which the q units are sold. Find the marginal-revenue product for the given value of m. 500m - m q = 50 , p= -0.1q +20; m =90 The marginal-revenue product when m = 90 is (Type an integer or a decimal.)