Count of accounts for last 3 consecutive months with <100$ change in the sales amount

[#1]

Hi Team,

I wanted to calculate the number of accounts as of month which is not grown >100$ for the last 3 months.  Please help how to calculate this.  I have attached the sample qvw.

Thanks in advance.

[sivarajs]

Sum({<Month_Num={">=$(=Max(Month_Num)-2)<=$(=Max(Month_Num))"},Amount={'<100'}>} Amount)