It might be useful if it remembered a bill for, say, 60 days, and could also comment on percent difference since the last one. "The total amount due on the bill

It might be useful if it remembered a bill for, say, 60 days, and could also comment on percent difference since the last one. "The total amount due on the bill is $83.89 which is 4% higher than last month's bill from the same company."