The selling price of a radio was $Rs. 255$ when $15 \%$ discount was allowed. Then the marked price of the radio was (in $Rs.$)

Ticket for an adult is $Rs. 1500$ and that of a child is $Rs. 800$. One child goes free with two adults. If a group has $25$ adults and $12$ children,what is the discount the group gets? (in $\%$)

If two successive discounts of $50 \%$ and $10 \%$ are offered,what is the net discount (in $\%$) ?

The true discount on a certain bill due for nine months at $4 \%$ simple interest is $Rs.\, 150$. Find the amount of the bill (in $Rs.$).

$A$ retailer gets a discount of $40 \%$ on the printed price of an article. The retailer sells it at the printed price. His gain percent is

The marked price of an item is $Rs. 900$. On the purchase of $2$ items,the discount is $16\%$,and on the purchase of $5$ items,the discount is $44\%$. If Raksha buys $7$ items,what is the effective discount percentage?