Current market price = $ 80 per ton
A. Discount rate = 5% per year
After a year the price of coal will increase by 5%. The price will increase at the same rate with which the value of money is changing. Therefore, the future price of coal will be



Price after one year = $ 84 per ton.
B. After the congress imposes a tax on coal the supply curve shifts leftwards then the quantity demanded decreases and the equilibrium price increases.
Refer the attached picture it is just for reference, in question it is not asked to draw graph.

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