Question 1208254
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<pre>

From the context, this problem is about simple (not compounded) interest.


Write the basic equation for simple interest

    I = A*r*t,


where  I is the interest,  r is the annual interest rate, t is years.


For our problem, this equation becomes

    2520 = 10500*r*4.


The unknown is "r", and you find it from this equation

    r = {{{2520/(10500*4)}}} = 0.06.


<U>ANSWER</U>.  The annual interest rate is 0.06, or 6%.
</pre>

Solved.


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To see many other similar &nbsp;(and different) &nbsp;solved problems on simple interest accounts, &nbsp;look into the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/percentage/lessons/Simple-interest-percentage-problems.lesson>Simple interest percentage problems</A> 

in this site.


Learn the subject from there.