Answer :
The rule of the simple interest is
I = Prt, where
P is the money invested
r is the rate
t is the time
In the question
P = $7500
r = 3% = 3/100 = 0.03
t = 5
Substitute these values in the equation above
[tex]I=7500\times0.03\times5[/tex]I = 1125
The interest is $1125