A. 10.3 assuming that 113.1 is given
Answer: 19 years
Step-by-step explanation:
Given
Amount invested 
Rate of interest 
after 1-year amount becomes

After n years it is

Sum accumulated is 

Doug because his sequence follows a rule of multiplying by -1/2
Hope I got it right for your sake.
I hope u all know these are a series of bot accounts