$134 \%$ of $3894 + 38.94$ of $134 = ?$

Aditya has some amount,out of which $25 \%$ is stolen,$10 \%$ he gave to his friend,$50 \%$ of the remainder is spent on a party,and the rest $Rs. 26$ he gave to his mother. What was his initial amount?

The average marks obtained in a class of $50$ students is $70 \%$. The average of the first $25$ students is $60 \%$ and that of the next $24$ students is $80 \%$. What is the percentage of marks obtained by the last student?

$23 \% \text{ of } 6783 + 57 \% \text{ of } 8431 = ?$

If $35 \%$ of a number is $175,$ then what percent of $175$ is that number (in $\%$)?

If the side of a square is increased by $30 \%,$ its area is increased by: