Mindy's dog, Rex, weighed 80 pounds a year ago. Now he weighs 92 pounds. What is the percent increase in his weight?

15%

Step-by-step explanation:

To find the percent increase, use the equation:

percent of increase=amount of increase

original amount

The amount of increase is 92-80 = 12. The original amount of 80; this gives us

12/80 = 0.15 = 15%