(15 pts) A wood specimen with a cross section of 1 in. x1 in, and a span of 10 in was tested in bending by applying a load at the middle of the span. It was found that the maximum load can be applied to this specimen is 300 lb. If this wood is used to make a simply supported beam with dimension of 6 in. x 6 in. and a span of 20 ft. Find the maximum load can be applied to the mid-span of this beam.