Correct Answer: 11/4% gain
Explanation:
Given that a = 10% , b = 16g and c = 18g = [(100 - a)c /b - 100)]% = [(100 - 10) x 18/16 - 100]% = [90 x 18/16 - 100]% = [90 x 9/8 - 100]% = 810/8 - 100 % = (810 - 800) / 8 % = 10/8 % = 5/4 % =11/4% gain