Sunil decided to donate $5 \%$ of his salary. On the day of donation,he changed his mind and donated $₹ 1687.50$,which was $75 \%$ of what he had decided earlier. How much is Sunil's salary?

In a gram panchayat meeting,$1000$ people voted on a resolution with $10 \%$ of the votes being invalid. After some discussion,$1000$ people voted again. This time there were $20 \%$ invalid votes. The opponents were increased by $50 \%$ while the motion was now rejected by a majority,which is $300 \%$ more than it was formerly passed by. How many people voted against the resolution before the discussion?

If one number is $80 \%$ of the other and the sum of their squares is $656$,then the numbers are:

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

About $8 \%$ of the voters in an election did not cast their votes. In this election,there were only two candidates. The winner,by obtaining $48 \%$ of the total votes,defeated his contestant by $1100$ votes. The total number of voters in the election was:

$16 \frac{2}{3} \%$ of $600 \, \text{gm} - 33 \frac{1}{3} \%$ of $180 \, \text{gm}$