Jada is making a circle graph of her college tuition and fees. She spends 10% of her expenses on board. Since a circle has 360°, Jada knows that the central angle for that section of the graph is 36°. She thinks she can use what she knows about angle relationships to help her figure out the number of degrees for the central angle for the section of the graph that represents her room expenses. Which equation could be used to help her solve this problem?