Percentages

• How Many Games Did the Team Play Overall?
  Assuming every game was a win or loss and the percentages are exact, the team played 15 games initially and 20 games overall.
• How to Calculate a Percentage on a Negative-to-Positive Scale
  Map a value on a negative-to-positive range with a min–max formula, and distinguish that from percentage change when the starting value is negative.
• How Do You Calculate Percentage Change Over Multiple Years?
  Calculate total change from the starting and ending values, or use the compound annual growth rate to express the change as an equivalent yearly percentage.