If the salary of Manoj is $40 \%$ less than that of Subhash,then by how much percentage is the salary of Subhash more than that of Manoj?

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

In a class of $50$ students and $5$ teachers,each student received sweets equal to $12 \%$ of the total number of students,and each teacher received sweets equal to $20 \%$ of the total number of students. How many sweets were there in total?

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

The population of a town increases by $12 \%$ during the first year and decreases by $10 \%$ during the second year. If the present population is $50400$,what was it $2$ years ago?