$1$ quintal $25$ $kg$ is what percent of $1$ metric tonne?

If $₹ 2800$ is $\frac{2}{7}$ percent of the value of a house,the worth of the house (in $₹$) is

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

If the length of a rectangle is increased by $20 \%$ and its breadth is decreased by $10 \%$,what will be the impact on its perimeter?

$A$ bag contains $600$ coins of $25$ paise and $1200$ coins of $50$ paise. If $12 \%$ of $25$ paise coins and $24 \%$ of $50$ paise coins are removed,the percentage of money removed from the bag is nearly: (in $\%$)

In an examination,there were $2000$ candidates,out of which $900$ candidates were boys and the rest were girls. If $32 \%$ of the boys and $38 \%$ of the girls passed,then the total percentage of failed candidates is: