Consider the productivity function Q left parenthesis L right parenthesis equals 100 L to the power of 0.65 end exponent, where L is labor hours and Q is the quantity of units a factory can produce. Suppose at a particular moment in time, L = 980 labor hours, and that number is increasing by 4 labor hours per month. Given this, compute the rate of change of the productivity Q at this time with respect to time in months. Give only a numeric response (no labels). If necessary, round accurate to the nearest integer.