A steel plate (called a cover plate) having cross-sectional dimensions 6.0in. x 0.5 in. is welded along the full length of the bottom flange of a W 12 x 50 wide-flange beam (see figure, which shows the beam cross section).
What is the percent increase in the smaller section modulus (as compared to the wide-flange beam alone)?

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W12×50 6.0 × 0.5 in, cover plate