Calculation of Annual income

Hi all,
Am working in a form where I am struck with condition.
I will enter number of households(2) in family
I will enter manually each household income A1:100 and A2 :100
Based on that Annual Income of family should automatically updated is.. ,so ${A1}+${A2} gives 200
But for scenario's where each time entering different number of households then how can to auto calculate Annual Income from each individual annual income

Thanks in advance.


You will find your solution on this post.

Hope this helps.