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

In two successive years,$80$ and $60$ students of a school appeared at the final examination,of which $60 \%$ and $80 \%$ passed respectively. The average rate of students passed (in percent) is

Sashi has $Rs. 90000$ with him. He purchases a mobile,an iPad,and a laptop for $Rs. 15000$,$Rs. 13000$,and $Rs. 35000$ respectively and puts the remaining money in his bank account which pays $15 \%$ per annum compound interest. After $2$ years,he sells off the three items at $80 \%$ of their original price and also withdraws his entire money from the bank by closing the account. What is the total percentage change in his assets (in $\%$)?

$A$ man donates $30\%$ of his wealth to charity. He gives $30\%$ and $25\%$ of the remaining wealth to his wife and son respectively. The rest he divides equally between his three daughters. One of his daughters gets $Rs$ $42$ lakh as her share. What was the man's total wealth (in $Rs$ lakhs)?

$A$ 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 $\%$)

If the price of a shirt is increased by $25 \%$ and then decreased by $30 \%$,then what will be the net effect?