Can someone help me with this problem mathematically. The answer is choice C. A swimmer is at the bottom of a 5-meter pool, where the gauge pressure (pgh) is approximately 0.5Patm. If the swimmer rises to the surface, by how much does the total pressure change? A. The total pressure increases by 33%. B. The total pressure increases by 66%. C. The total pressure decreases by 33%. D. The total pressure decreases by 66%. Thanks a lot everyone!