The Bathypelagic zone is the layer of Earth's oceans between 3,300 feet and 13,100 feet deep. At a depth of 3,300 feet, the water pressure of the Bathypelagic zone is 1,470 pounds per square inch, and at a depth of 13,300 feet, the water pressure is 5,850 pounds per square inch. For every additional 100 feet of depth, the water pressure increases by k pounds per square inch. What is the value of k?