Quandaries
and Queries 

Brian wants to borrow some money from Margaret. After three years he is to pay X back plus one interest sum of 25%. If he is pays back a total of $3800, what was the original sum borrowed? What is the formula? I've got quite a few questions like this. thanks 

Hi Penny, This question looks strange, but let me answer what is asked. Brian borrows $X from Margaret. At the end of three years he pays back the $X plus and interest charge of 25% of the original loan. That is he pays back
which is
This payment is $3800 so
What I find strange about this problem is that the interest is stated as one payment of 25% of the loan. I would have expected an interest of sume percent per year for three years. Penny 

