please help, my second time posting this question and last answer didnt help

In the process of performing an analysis, you determine that you need to improve the precision by limiting the error in the absorbance to 7.200105. You attempt to achieve this by reducing the amount of stray light that reaches the detector. What is the maximum amount of stray light that can reach the detector that will limit the error in the absorbance to 7.200105 for a true absorbance of 1.2000000 ? S %