A heart surgeon is skillful at unplugging arteries and rerouting the flow of blood, and these skills also make her a very skillful plumber. She can clear a clogged drain in six minutes, about 10 times faster than the most skillful plumber in town. Suppose the surgeon earns $25 per minute in heart surgery, and the best plumber in town charges $100 per hour. How much (in dollars) does the surgeon gain by hiring the plumber to clear a clogged drain