20. As shown in the figure below, Mr. Thompson, who is standing at point A, needs to determine the distance from point C on the ground to point E at the top of one of the second-story windows of his house.He places a mirror on the ground at point B so that when he looks in the mirror, he can see the top of the window. Mr.Thompson's eye level, at point D, is 6 ft above the ground. He notes that AB = 4 ft and BC = 14 ft. Approximately how many feet above the ground is the top of the second-story window?

(Note: In △ABD and △CBE, ∠ABD is congruent to ∠CBE.)