Question 655587
I=Prt is the formula for simple interest.  And the formula for the accumulated amount is A = P+I  (the original principal plus the interest accumulated.)<P>
6900-I=x and I = x*.05*3<P>
I = .15x so 6900 - .15x = x<P>
6900 = 1.15x<P>
6900/1.15 = x = 6000