A study finds that the noise from airplanes is harmful; hence, the government imposes a $25 tax on the sale of every airplane. This amount accurately accounts for the external cost of the noise pollution. Before the corrective tax, airplane tickets regularly sold for $190. After the tax is in place, the market price for airplane tickets rises to $200.A study finds that the noise from airplanes is harmful; hence, the government imposes a $25 tax on the sale of every airplane. This amount accurately accounts for the external cost of the noise pollution. Before the corrective tax, airplane tickets regularly sold for $190. After the tax is in place, the market price for airplane tickets rises to $200.a. Because of the tax, the number of airplane tickets sold will decrease . b. The socially optimal price of airplane tickets is $ c. The private market price is $ d. A firm selling airplane tickets receives $ after it pays the tax.

If a tax is levied on a good or service, it makes the good or service more expensive and quantity demanded would fall as a result. So the demand for airplane tickets is expected to fall as a result of the impostion of tax.

The social optimal price of the ticket is the priceof the ticket after the impostion of tax. This is $200

The private market price is the price before the impostion of tax. This is $190

How much the firm receives after paying for tax = social optimal price - tax

$200 - $25 = $175

I hope my answer helps you