Mia invests $4000 for 2 years and 3 months at 5% p.a. simple interest. What is the total value of the investment at the end of this period?

The interest on this is given by

I = Prt     

Here  P = $4000  r = 5% = .05   and t = 2 years 3 months = 2.25 years

So we have

I = 4000(.05)(2.25) = $450

So the total value is  $4000 + $450 = $4450