Question 1100339
.
<pre>A = 400 + 40*r = 200 + 80*r = B    (cost in cents)


Solve this equation

400 + 40r = 200 + 80r.


Can yo do it on your own ?
</pre>


If not, then read the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/equations/How-to-solve-a-linear-equation.lesson>HOW TO solve a linear equation</A>

in this site.