This Demonstration lets you specify the number of simulation trials to run, a random number stream for the simulation, the number of years until retirement, the initial amount in savings, and the fixed contribution amount to add each year. You can also define the minimum, most likely, and maximum return in a year. The results show the histogram of the total retirement amount for the number of trials. The results also indicate the lowest, percentile, median, average, percentile, and maximum retirement amount generated for the range of simulation trials. The red dot on the histogram indicates the average amount.