The price of a commodity rises from $Rs. 6$ per $kg$ to $Rs. 7.50$ per $kg$. If the expenditure cannot increase,what is the percentage reduction in consumption (in $\%$)?

If $x$ $\%$ of $y$ is $100$ and $y$ $\%$ of $z$ is $200,$ then find a relation between $x$ and $z$.

The cost price of goods of a bankrupt is $Rs. 25500$. If the goods had been realised at their full value,his creditors would have received $85$ paise in the rupee. But $2/5$ of the goods were sold at $17\%$ below their cost price and the remainder at $22\%$ below their cost price. How many paise in a rupee was received by the creditors?

The price of petrol went up by $20 \%$. In order to keep expenses the same,Ram must reduce travel by: (in $\%$)

$67 \%$ of $801 - 231.17 = ? - 23 \%$ of $789$

Three candidates contested an election and received $1136$,$7636$,and $11628$ votes respectively. What percentage of the total votes did the winning candidate get?