<PRE><B>Question 374374</B>
Ryan is going to invest $1200 at a 7% annual interest rate.
 How long will it take him to earn $252 in interest(I=prt)
:
Write the equation:
p * r * t = I
:
replace p, r, and I
1200 * .07 * t = 252
:
84t = 252
t = {{{252/84}}}
t = 3 yrs
:
:
Check it
I = 1200 * .07 * 3 </PRE>