For the beam cross-section given in the figure; a) Obtain the M, bending moment capacity. b) Calculate the capacity increase ratios for the cases given below; i. b width is increased by 15%. ii. As reinforcement is increased by 15%. iii. d height is increased by 15%. iv. Compressive strength of concrete fod is increased by 15%. d' v. A compression reinforcement area of 4 = 4,/2 is used. As For each case evaluate the cost of the beam per meter. Draw a diagram for M-cost. Write a discussion paragraph about the variation.