if the cost price of 20 tables is equal to the selling price of 25 tables(find the profit or loss%)

$$\begin{gathered} Dear Student, \\ Here is the answer to your query. \\ Given : Cost price (C. P.) of 33 articles = Selling price (S.P.) of 30 articles \\ Let C. P. of 33 articles be Rs x \\ \therefore C. P. of 1 article = Rs \frac{x}{33} \\ Also S. P. of 30 articles = Rs x \\ \therefore S. P. of 1 article = Rs \frac{x}{30} \\ As S. P. is greater than C. P. \\ Thus Profit = S. P. of 1 article – C. P. of 1 article \\ =\frac{x}{30}-\frac{x}{33} \\ =\frac{11x-10x}{330} \\ =\frac{x}{330} \\ We know that \\ Profit\%=\frac{profit}{CP}\times 100 \\ =\frac{{\displaystyle \frac{x}{330}}}{{\displaystyle \frac{x}{33}}}\times 100 \\ =\frac{\cancel{x}}{330}\times \frac{33}{\cancel{x}}\times 100 \\ =\frac{1}{10}\times 100 \\ Profit \% =10\% \\ Regards \end{gathered}$$