Answer:
From $100 to $150: up by 50%
From $150 to $100: down by 33 1/3 %
From $100 to $160: up by 60%
From $160 to $100: down by 37 1/2 %
From $160 to $200: up by 25%
From $200 to $160: down by 20%
From $200 to $150: down by 25%
From $150 to $200: up by 33 1/3 %
From $100 to $200: up by 100%
From $200 to $100: down by 50%
From $150 to $160: up by 6 2/3 %
From $160 to $150: down by 6 1/4 %
