Question

What is the surface area of the composite figure?

A three-dimensional composite figure that resembles two stairs is shown. The length of the bottom step is six centimeters. The upper step extends from the middle of the bottom step outward toward the right. The length of the upper step is fifteen centimeters. The part of the upper step that extends beyond the edge of the bottom step is twelve centimeters. The height of each step is three centimeters. The width across each step is also three centimeters.