Question 29341
<pre>
                      PRICE          QUANT.           COST ( in Rs)

Normal Price          10x           22500/(10x)        22500

Reduced Price          9x           22500/(9x)         22500

Difference                           25
</pre>
{{{22500/(9x)-22500/(10x)=25}}}

-

{{{2500/x-2250/x=25}}}

{{{250/x=25}}}

{{{x=10}}}

Original price was {{{10x=10*10=highlight(100)}}} {{{Rs_per_kg}}}.



check:
{{{22500/90-22500/100}}}
{{{250-225}}}
{{{25}}}
{{{as_described}}}