Perpendicular offsets are measured at intervals of 50 ft, from a traverse line to a curved boundary. The offset distances are given as follows: 12.5, 27.6, 49.2, 87.5, 123.4, 159.0, 135.7, 102.4, 74.1, 32.5, 13.4, and 6.8 ft. The last interval is 28.5 ft. Compute the area, in acres, between the traverse line and the boundary line.