Math Help Decimals To Fractions

Question: Story problem fractions Math Help!?!?
Before April 9, 2001, when the U.S. securities and exchange commission ordered all U.S. stock markets to report stocks in decimals, the price of stock was reported in fractions. Under the fractional reporting system, what was the change in stock price if a stock opened the day 31 1/8 and closed the day at 28 5/32?
Answer: I don’t know whether to add or subtract.
But if you add you would get this :
59 9/32
Or if you subtract:
3 -1/32
Excel Busn Math 22: Convert Decimals & Fractions To Percent