A shop tracks how prices move. Write percent_change(old, new) that returns the percentage change from old to new, rounded to 1 decimal place. A decrease is negative.
Examples
Input: old = 50, new = 75
Output: 50.0
Input: old = 80, new = 60
Output: -25.0
Input: old = 200, new = 200
Output: 0.0
Constraints
1 <= old <= 10**60 <= new <= 10**6- Return a float rounded with
round(x, 1).
Goals
- Apply the percentage-change formula
- Round a float to a fixed number of decimals