If the cost price of $20$ tables is equal to the selling price of $25$ tables,find the loss percentage. (in $\%$)

If the selling price of $50$ articles is equal to the cost price of $40$ articles,then the loss or gain percent is:

$A$ shopkeeper labeled the price of his articles in order to earn a profit of $30 \%$ on the cost price. He,then,sold the articles by offering a discount of $10 \%$ on the labelled price. What is the actual rate of profit he earned in the deal? (in $\%$)

$A$ sells an article to $B$ for $₹ 45,000$ losing $10 \%$ in the transaction. $B$ sells it to $C$ at a price which would have given a profit of $10 \%$ to $A$. By what per cent does $B$ gain?

Find $CP$ when $SP = Rs. 51.70$ and $\text{loss} = 12\%$.

$A$ shopkeeper sells one transistor for $Rs.\, 840$ at a gain of $20 \%$ and another for $Rs.\, 960$ at a loss of $4 \%$. His total gain or loss percent is