please solve it in 20 mins I will thumb you up

it's simple question solve it fast

Question 20 (1 point) Due to the nature of the patent laws on pharmaceuticals, what happens to the market for such drugs? It remains a monopolistic market indefinitely It switches from monopolistic to competitive once the firm's patent runs out It switches from competitive to monopolistic once the firm's patent runs out It remains a competitive market indefinitely Question 21 (0.5 points) The cost of an action is measured in terms of foregone opportunities. True False Question 25 (0.5 points) A linear demand curve has constant elasticity, but not constant slope. True False Question 26 (0.5 points) Binding price ceilings benefit consumers because they allow consumers to buy all the goods they demand at a lower price. True False Question 27 (0.5 points) Connie can clean windows in large office buildings at a cost of $1 per window. The market price for window cleaning is $3 per window. If Connie cleans 100 windows, her producer surplus is $100. True False