這題微積分怎麼解？

Q(p) = p^2+4p+900 units of a harmful polluntant in the air when the

population is p = 1000 people.

Population is currently p = 50 thousand pepople

Increasing at the rate of dp/dt = 1.5 thousand pepople/year ,

at what rate is the level of pollution increasing dQ/dt = ?


dQ/dt = dQ/dp * dp/dt

= (2p + 4)*1.5 thousand

= (2*50 thousand + 4)*1.5 thousand

= 104 * 1.5

= 156 units/year