The present worth of $Rs. 220.50$ due in $2$ years reckoning compound interest at $5 \%$ per annum is (in $Rs.$):

$A$ merchant marks an article $20\%$ above cost price. He then sells it at a discount of $20\%$. The sale gives him

The $T.D.$ on $Rs. 936$ due after a certain time at $8\%$ per annum is $Rs. 36$. The money is due after (in months):

The difference between a discount of $40 \%$ on $Rs. 500$ and two successive discounts of $36 \%$ and $4 \%$ on the same amount is (in $Rs.$)

Successive discounts of $10 \%$,$20 \%$,and $30 \%$ are equivalent to a single discount of (in $\%$):

$A$ bill for $Rs. 8000$ is drawn on September $19$ for $6$ months. It is discounted on January $8$ at $10\%$. Find the banker's discount,true discount,banker's gain,and the money that the holder of the bill receives (in $Rs.$).