When the price of a toy was increased by $20 \%$,the number of toys sold was decreased by $15 \%$. What was its effect on the total sales of the shop?

$A$ shopkeeper undertakes to supply $2000$ tables at $Rs. 1725$ each. He estimates that if $10\%$ are defective,which will be sold at $50\%$ of the original price,then the profit will be $15\%$ on his whole outlay. When the tables were supplied,$70\%$ of the tables were found defective. What loss did the shopkeeper incur?

If $A$ is $150 \%$ of $B$,then $B$ is what percent of $A+B$?

What percentage of numbers from $1$ to $70$ have squares that end in the digit $1$?

Ram donated $4 \%$ of his income to a charity and deposited $10 \%$ of the rest in a bank. If now he has $Rs$ $8640$ left with him,then his income is

The price of cooking oil has increased by $15 \%$. The percentage of reduction that a family should effect in the use of cooking oil so as not to increase the expenditure on this account is: