If the discount of 10% is given on the marked price of a radio, the gain is 20%. If the discount is increased to 20%, the gain per cent is :

If $x^{2}+y^{2}+z^{2}=2(x+z-1)$, then the value of : $x^{3}+y^{3}+z^{3}=?$

If $\frac{\sec \theta+\tan \theta}{\sec \theta-\tan \theta}=2 \frac{51}{79}$ then the value of $\sin \theta$ is

If $a+b-c=0$ then the value of $2 b^{2} c^{2}+2 c^{2} a^{2}+2 a^{2} b^{2}$ $-a^{4}-b^{4}-c^{4}$

A dealer buys an article listed at Rs. 100 and gets successive discounts of 10% and 20%. He spends 10% of the cost price on transportation. At what price should he sell the article to earn a profit of 15%?

In $\triangle A B C, D$ and $E$ are two mid points of sides $A B$ and $\mathrm{AC}$ respectively. If $\angle \mathrm{BAC}=40^{\circ}$ and $\angle \mathrm{ABC}=$ $65^{\circ}$ then $\angle \mathrm{CED}$ is :

If x = z = 225 and y = 226 then the value of : x³ + y³ + z³ – 3xyz is

If $\tan \mathrm{A}+\cot \mathrm{A}=2$, then the value of $\tan ^{10} \mathrm{~A}+$ $\cot ^{10} \mathrm{~A}$ is

If $4 a-\frac{4}{a}+3=0$ then the value of : $a^{3}-\frac{1}{a^{3}}+3=?$

If the area of the base, height and volume of a right prism be $\left(\frac{3 \sqrt{3}}{2}\right) \mathrm{P}^{2} \mathrm{~cm}^{2}, 100 \sqrt{3} \mathrm{~cm}$ and $7200 \mathrm{~cm}^{3}$ respectively, then the value of $\mathrm{P}$ will be