In June, the Zavala family's NIPSCO bill was $150. In July their NIPSCO bill was $180. Mrs. Zavala said that the bill increased by 30%. Mr. Zavala said it increased by 20%. Who is correct?

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .