Answer: 99 cm^2
Explanation:
The easiest way to solve the surface area of these shapes is to draw a net of the shape and calculate the area of all the different shapes in the net.
Area for triangle: 1/2 * b*h - or for this shape just base times height because you have 2 triangles.
Area for rectangle: length times width.
The measurements I came up with are 15 for BOTH the triangles, 30 for one of the rectangles, 18 for the other, and 36 for the last rectangle which put together all equal to 99 cm^2.
Tell me if it works