A study shows that when the market price is p (in dollars per unit), the number q of units that manufacturers of a certain commodity will produce monthly satisfies the the equation 1600p : gr2 I 200g | 10000. Suppose q : q(t) and p : p(t) are both functions of time. If the current price is $100 per unit and the price is currently increasing at the rate of $10 per month, find M the current rate of change per month in the supply, that is, E