Answer:
c. $100,000
Explanation:
Since in the question it is given that the price elasticity of demand is unit elastic that means it is equal to one plus the total revenue do not changed if there is a change in price and the quantity demanded
So in this case, the new revenue is
New revenue = Price × Quantity
= $100 × $1,000
= $100,000
Hence, the correct option is c.