Divide the decrease by the original number and multiply the answer by 100. The fix is to leverage the ABS function to negate the negative benchmark value. For this use the ABS function.
In this case the answer is 216 so your income increased by 216.
In this case the answer is 216 so your income increased by 216. Increase Increase Original Number 100. On Percentage calculation with negative numbers. In this case the answer is 216 so your income increased by 216.