What you see isn't always what you get.
I designed the "Mother of All Thumbwheels" that calculates Social Security benefits and the degree to which we will under- or overshoot our retirement income need. It also illustrates how much we will have in our retirement plans in 10, 20 and 30 years given different monthly contribution levels. It shows, for instance, that $500 a month for 10 years will accumulate to $91,000 if it earns 8 percent over that period. At 12 percent, the same $500 grows to $114,000. In 20 years, the comparable numbers are $294,000 and $494,000 respectively.