Answer:
6% increase
Explanation:
John's income in 2019: $21,500
2020: $22,790
1) Use the percentage increase formula:
[(New value - old value) / old value] * 100
The new value is $22,790 and the old is $21,500
2) Insert the values into the formula:
[(22,790 - 21,500) / 21500] * 100
[(1,290 / 21,500] * 100
The percentage increase is 6%.