Question

The price per share of a certain stock fell from 31.46 to close at 29.42 find the percent decrease

Answer 1

31.46 - 29.42 = 2.04 dollars
Now this being said all you have to do is put 2.04 over 31.46 and divide.

2.04
———- = 0.06484425
31.46

Move decimal point over to get the appropriate percentage:
6.48% decrease