Question 18727
the eqn. for simple interest is 
I=p*t*r..if r is given as fraction and I=p*r*t/100..if r is given as percent(%)

we have p=7500, r=.035, t=6  ...substituting we get 
I=7500*0.035*6=75*3.5*6=75*21=1575 is the answer