A doubly reinforced rectangular concrete beam has a width of 300 mm and an effective depth of 500 mm. The beam is reinforced with 2000 mm2 of steel in tension and 600 mm2 of steel in compression. The effective cover for compression steel is 50 mm. Assume that both tension and compression steel yield. The grades of concrete and steel used are M20 and Fe250, respectively. The stress block parameters (rounded off to the first two decimal places) for concrete should be as per IS: 456-2000. The depth of the neutral axis is _______
1
150 mm
2
160 mm
3
147.3 mm
4
143.47 mm