Correct Answer: decreases by 25%
Explanation:
Here, x = -50%, y = 200% According to the formula Net effect = [2x + y + x2 + 2xy/100 + x2y/1002] % = [-100 + 200 + 2500 - 20000/100 + 500000/10000]% = [100 - 175 + 50] % = -25%