This puzzle appears in episode 2, and it’s about compound interest. Select the text below if you want to read a hint.

Try selecting the first bullet point alone, see if that helps. If not, select the first two, etc. The answer isn’t really important.The whole point is to enjoy the process of working on a puzzle.

*There is a mathematical formula for compound interest, paid at the end of each year*
*That formula is: A=P·(1+r)^n, where…*

*A=money you get at the end of the term;*

*P=Principal at beginning of the term;*

*r= interest rate (i.e. 1% interest would be r = 0.01);*

*and n=number of years for which compound interest accrues.*

*For example, $100,000 at 1% for 10 years = $100,000·(1+.01)^10 = $110,462.21*
*You can plug real numbers into that equation to get the answer, but… **if you like algebra, rewrite the equation to take the two separate 10-year terms into account*
*That gives you: A = P · (1+r1)^n1 · (1+r2)^n2*
*What happens to that equation when you swap the first and second terms?*

The answer to puzzle 2 is in Episode 3.