Create Chart Display

Looking for someone to create a chart display that illustrates the compounding effect of people making an average of 6 monthly payments on an invoice that is due. For example, on Day #1, if 3 people promised 6 monthly payments on a $600 invoice then Day #1 would have $300 in revenue, Day #31 would have $300 in revenue (and so on) until Day #180. On Day #2, the same scenario would occur. However, on Day #31 the $300 already promised on Day #1 would be COMBINED with 3 new people paying $100 over the next 6 months. This is a type of COMPOUNDING EFFECT that continues to grow for the next 180 days. I NEED HELP WITH SOMEONE CREATING A FLASH OR HTML CHART THAT ILLUSTRATES THIS CONCEPT!!!