The minimum acceptable ventilation rate for public spaces is often taken to be 8 liters per second per occupant (8 L/s-person). This ventilation rate is based on the idea that the indoor CO2 concentration should be less than the outdoor concentration plus 700 ppm (C Cout + 700 ppm) (ASHRAE Standard 62.2001). Using a mathematical calculation (start with the relevant differential equation and a steady-state analysis), justify this occupant-number-based ventilation rate. Assume a person emits 35 g CO2/h.