$A$ man buys an article for $Rs. 27.50$ and sells it for $Rs. 28.60$. Find the gain percent. (in $\%$)

The marked price of a tape recorder is $Rs. 12,600$. $A$ festival discount of $5 \%$ is allowed on it. Further,for cash payment,a second discount of $2 \%$ is given. The cash payment,in rupees,to be made for buying it is: (in $.60$)

If the cost price of $12$ pens is equal to the selling price of $8$ pens,find the gain percent.

Successive discounts of $10 \%$,$12 \%$ and $15 \%$ are equivalent to a single discount of:

Rajesh sells a tape recorder to Mihir at a loss of $10 \%$,and Mihir sells it to Shiv at a loss of $20 \%$. If Shiv pays $Rs. 1440$ for it,at what price did Rajesh buy it? (in $Rs.$)

$A$ shopkeeper fixes the marked price of an item $35 \%$ above its cost price. The percentage of discount allowed to gain $8 \%$ is......$\%$