How much will you have from your investment after four years?

Given :
The principal = P = $2600
The simple interest rate = r = 5% = 0.05
The time = t = 4 years
so, The simple interest = I
[tex]I=P\cdot r\cdot t=2600\cdot0.05\cdot4=520[/tex]so, the answer is : after 4 years, you will have $52