What is the difference in price between these two products?

He is an expert in biochemistry.

The use of chemical weapons is prohibited by international law.

He is known as a person of erudition.

This picture frame is my favorite.

After graduating from high school, he decided to go on to university.

He is an expert in pathology.

Every day, I commute to school by bus.

How much is the total amount of this project?

He saved money to buy that expensive painting.