Question : If the cost of 20 books is equal to the selling price of 18 books, then the gain percentage is:

Option 1: $11 \frac{1}{9}$%

Option 2: $11 \frac{1}{3}$%

Option 3: $11 \frac{2}{9}$%

Option 4: $10 \frac{1}{9}$%

Question : Choose the option in which the numbers are in the correct ascending order.

Option 1: $\frac{4}{5}, \frac{2}{3}, \frac{1}{11}$ and $\frac{2}{9}$

Option 2: $\frac{1}{11}, \frac{2}{9}, \frac{2}{3}$ and $\frac{4}{5}$

Option 3: $\frac{2}{9}, \frac{1}{11}, \frac{4}{5}$ and $\frac{2}{3}$

Option 4: $\frac{2}{3}, \frac{4}{5}, \frac{1}{11}$ and $\frac{2}{9}$

Question : If $(4 y-\frac{4}{y})=13$, find the value of $(y^2+\frac{1}{y^2})$.

Option 1: $12 \frac{11}{16}$

Option 2: $10 \frac{9}{16}$

Option 3: $12 \frac{9}{16}$

Option 4: $8 \frac{9}{16}$

Question : If $\frac{21\cos A+3\sin A}{3\cos A+4\sin A}=2$, then find the value of cot A.

Option 1: $\frac{9}{11}$

Option 2: $\frac{11}{9}$

Option 3: $\frac{1}{3}$

Option 4: $\frac{11}{10}$

Question : If a 10% loss is made on the selling price, the percentage of loss on the cost price will be:

Option 1: $11\frac{1}{9}\%$

Option 2: $9\frac{1}{11}\%$

Option 3: $10\%$

Option 4: $11\%$