Interest is calculated as a percentage of a loan balance, paid to the lender periodically for the privilege of using there money.
I think they are still used and relevant today because people know that they are very significant. people take that they were written long ago into consideration and that makes it more valuable
The answer I think to this is C. Eisenhower
Hope this helps in anyway? and sorry if it's wrong.
Multiple people had different views on what they wanted so in order to satisfy everyone there was a compromise of multiple parties for the extensive views