Question 534340
<B>Check my profile and contact me for one on one online tutoring.</B><P>

The formula for simple interest is I = P * r * t where:<P>
I = interest<br>
r = yearly interest rate.  If not time frame is given for the interest rate, such as "annual" or "daily" or "monthly", then yearly is assumed. <br>
t = t in years.  18 months is 1.5 years.  <P>
In this case the I, interest earned is:<br>
I = 750*(7.5/100)*1.5 = 84.375 rounded to $84.38