Question 89106
3.25% annual simple interst to amount to $6510 in 5

Let the principal amount = P
The interest on this let it be I

Given amount A after 5 years i.e A = 6510

or P+I = 6510

But I = (PTR)/100 where P = Prinicipal,T= Time and R = Rate

So I = PTR/100
   I = (Px5x3.25)/100 

20I = 3.25P
4I = .65 P

4(P+I) = 4x6510
4P +4I = 4x6510
4P +.65P = 4x6510

4.65P = 4x6510

I hope you can solve from here