D Question 4 Suppose that there is a carbon tax of $Y/donne CO. (we do not know what Y is). How much CO2 will this Industry amit under this carbon tax, as a function of Y? 3 b. 300 - ZY Question 5 What is the socially optimal carbon tax? Le. the tau, In Morine. that Incentivizes the socially optimal production and emissionsFor questions 2-5, suppose that There are 3 firms that produce coal. There is a constant coal price, p = $35/tonne coal. Coal produces 0.2 tonnes of CO2 emissions/tonne coal. The social cost of carbon is $100/tonne CO2 emissions. The private marginal cost for firm / Is, as a function of firm I's quantity produced, qi: MCI = $5/tonne coal + 0.1ql/tonnes coal^2 Question 2 How much CO2 will this industry emit without regulation? 2 180 tonnes O b. 120 tonnes O , 900 tonnes Od. 300 tonnes Question 3 How much CO2 is socially optimal for this industry to emit? Q E. 600 tonnes O d. 300 torines O a. 100 tonnes Old. 60 tonnes