Really? I can figure out equations with ease. Perhaps if you gave me information on each one I can help with some sort of graph.
For instance, with a loan of $500 and an compounded interest rate of 2.5% each month. Without paying on it, how much would be owed at the end of a year?
Make a graph to help. 500 * 2.5 + 500 would give you the first month, then you take that total and substitute the '500' with the new value, and continue that way.
I know it doesn't help in the least, that example, but i just wanted to show you i can assist, possibly...
btw, the first person to PM me with the answer, wins a pie!