If on selling $12$ notebooks,a seller makes a profit equal to the selling price of $4$ notebooks,what is his percent profit?

$A$ merchant purchases a wrist watch for $₹ 450$ and fixes its list price in such a way that after allowing a discount of $10 \%$,he earns a profit of $20 \%$. Then the list price (in rupees) of the wrist watch is

In a certain store, the profit is $320 \%$ of the cost. If the cost increases by $25 \%$ but the selling price remains constant, approximately what percentage of the selling price is the profit?

Find $SP$ when $CP = Rs. 56.25$ and $\text{Gain} = 20\%$?

$A$ buys an article and sells it to $B$ at a profit of $10 \%$. $B$ sells it to $C$ gaining $20 \%$. If $C$ pays $₹ 924$,what amount did $A$ pay? (in $₹$)

The difference between successive discounts of $40\%$ followed by $30\%$ and $45\%$ followed by $20\%$ on the marked price of an article is $Rs. 12$. The marked price of the article is (in $Rs.$)