Q6. The previous calculations indicate that the proposed main beam section is unable to resist the design moment. To address this, you decide to fill in the 140mm gap between the two beams with an additional two 300mm x 75mm (i.e. 280 x 70mm) sections. You also decide to specify a higher timber grade for the beams, corresponding to SG12. Do calculations to check whether SG12 main beams, realized with four 300mm x 75mm (i.e. 280 x 70mm) sections, would be able to resist a design moment of M*= 57kNm (M* is slightly higher due to increased self-weight). Report the ratio of demand to capacity; M*/ϕM_n. [%]