Actual meaning of itr processed status

I had filed an ITR will nearly 30% more income when compared to last year. I was worried because of demonetisation that my returns will be taken up for scrutiny. However, Now, my ITR has been processed. with Rs. 8 demand (I am told you can ignore it) My Question is - if the ITR is processed does that mean that the return will not be taken up for scrutiny? My next question is:- If this year i file returns with 25% less income from last year because bank interest rates have come down over the years. Does this mean that there is a substantial drop in income? Remember bank interest just a few years ago was 9.5-10% for Senior citizens and now it is around 7.5%. What is the criteria to determine if there is a substantial increase or fall in income