<prompt> Human: So heres an interesting question. I know it involves math, which Im not strong at.My 67K of loans are divided in the following 4 batches:23K at 6.419K at 6.814K at 6.821K at 5.41In what order should I pay them off in order to minimize the total amount I will end up paying, interest included? If the amount of time it takes matters not sure it does, lets say Im planning on paying it off in 12-18 months 6-4Kmo. Originally I thought, Ill pay off the highest interest batch first, then down the line, but then I realized, the highest interest batches have the smallest amount principal, so the higher interest rate will still collect less than the others... and now Im all confused. Thank you.  <response>: No math involved. Highest interest first minimizes total cost. 