$270$ candidates appeared for an examination,of which $252$ passed. The pass percentage is (in $\%$)?

In an election,a candidate who gets $84 \%$ of the votes is elected by a majority of $476$ votes. What is the total number of votes polled?

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

What percent of $4 \text{ km}$ is $8 \text{ meters}$?

$860\%$ of $50 + 50\%$ of $860 = ?$

Two jars contain equal quantities of $40 \%$ alcohol. Swati changed the concentration of the first jar to $50 \%$ by adding extra quantity of pure alcohol. Sonali changed the concentration of the second jar to $50 \%$ by replacing a certain quantity of the solution with pure alcohol. By what percentage is the quantity of alcohol added by Swati more than that replaced by Sonali?