Answer:
A. Deadweight loss = 125 units.
B. Deadweight loss = 25 units.
Explanation:
In a free market and completely efficient economy, the consumer surplus equals the producer surplus. Both benefits of free trade. When consumers o producers have a minor surplus, necessarily implies a loss on eficiency, usually caused by government regulations like taxes or price ceilings.
The amount of welfare lost is measure by the difference between consumer and producer surplus.
In the first case:
|Consumer surplus - producer surplus| = 25 units
|250- 125| = 125 units
And in the second case:
|180- 155| = 25 units