SUMPRODUCT Function With Date Calculation Criteria

I have a worksheet that contains investment security purchases, including purchase date, purchase amount and maturity date, each in its own row. I need to develop a formula that will sum the purchase amount based upon the term in days (maturity date - purchase date) of the investment. The respective rows do not contain the term in days so the formula will need to calculate the days to determine the aggregating criteria described below.

One cell should contain the aggregate security purchase amount whose term is 1-90 days and another cell should contain the aggregate security purchase amount whose term is over 90 days. It seems that SUMPRODUCT with a condition is the best way to handle this; however, I cannot get the correct syntax of this formula.