Question 1145642
.
<pre>
For the simple interest, the formula is


    I = P*r*t,


where I is interest value, P is the initial amount (deposit); r is the annual rate and "t" is time (in years).


To find "I" in your case, substitute P = 840 dollars;  r = 0.045 (annual percentage rate as decimal, and t = 4 years.


Then calculate  I = 840*0.045*4.


You may use your calculator/computer.
</pre>

Happy calculations (!)