Answer:
Explanation:
To find the percentage increase in Mr Hall's salary, we can use the following formula:
percentage increase = (new value - old value) / old value x 100%
Substituting the given values, we get:
percentage increase = (28000 - 25000) / 25000 x 100%
Simplifying the expression, we get:
percentage increase = 0.12 x 100%
percentage increase = 12%
Therefore, Mr Hall's salary increased by 12%.