From a container having pure milk,$20 \%$ is replaced by water and the process is repeated thrice. At the end of the third operation,the milk is: (in $\%$ pure)

Depreciation applicable to an equipment is $20 \%$. The value of the equipment $3$ years from now will be less by: (in $\%$)

$A$ $20 \%$ raise of price followed by a discount of $25 \%$ on the raised price will:

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?

Krishnamurthy earns $₹ 15000$ per month and spends $80 \%$ of it. Due to pay revision,his monthly income has increased by $20 \%$ but due to price rise,he has to spend $20 \%$ more. His new savings are

$A$ student multiplied a number by $\frac{3}{5}$ instead of $\frac{5}{3}$. What is the percentage error in the calculation (in $\%$)?