G A coal-fired power plant produces power p with costs c(p)=\frac{p^2}{6}. Each unit of power earns the plant \$ 10. Burning coal releases particulate matter (PM2.5), a pollutant that is known to cause heart disease, lung disease, and birth defects. The coal plant borders a wildlife sanctuary which sells tourism visits t for a price $30. However, the sanctuary's animals are getting sick due to the negative externality of PM2.5, such that the costs to the sanctuary are c(t)=\frac{t^2}{6} + \frac{p^2}{6}. The local government decides to tax the coal plant to internalize its negative externality. What tax will restore the social optimum?

Expert computers was started in 2018. the company experienced the following accounting events during its first year of operation: started business when it acquired $40,000 cash from the issue of common stock. purchased merchandise with a list price of $32,000 on account, terms 2/10, n/30. paid off one-half of the accounts payable balance within the discount period. sold merchandise on account for $28,000. credit terms were 1/20, n/30. the merchandise had cost expert computers $16,000. collected cash from the account receivable within the discount period. paid $2,100 cash for operating expenses. paid the balance due on accounts payable. the payment was not made within the discount period. required record the events in a horizontal statements model below. in the cash flows column, use the letters oa to designate operating activity, ia for investing activity, fa for financing activity, or nc for net change in cash. if the account is not affected by the event, leave the cell blank. the first event is recorded as an example. what is the amount of gross margin for the period? what is the net income for the period?