Question 1136508
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            Let me show you a shorter way to solve the problem and to present the solution.



<pre>
Let x be the original cost of the table.


Then Zuzu sold it at the price (1-0.2)*x = 0.8x.


In the second (hypothetical) case Zuzu would sold it at the price (1+0.5)x = 1.05x.


The problem says that


    0.8x + 800 = 1.05x.


Now you solve this equation in ONE LINE


    800 = 1.05x - 0.8x  ====>  800 = 0.25x  ====>  x = {{{800/0.25}}} = 3200.    <U>ANSWER</U>
</pre>

Solved.