The price of an article was increased by $r \%$. Later,the new price was decreased by $r \%$. If the latest price was $₹ 1$,then the original price was:

If the given two numbers are respectively $7 \%$ and $28 \%$ of a third number,then what percentage is the first of the second?

The sum of two numbers is $\frac{28}{25}$ of the first number. The second number is what percent of the first (in $\%$)?

In the laptop market,only three competitors (Lenovo,Apple,and Samsung) exist. Last year,the sales of Apple laptops were $10 \%$ more than Lenovo. This year,both the firms Lenovo and Apple increased their respective sales by $20 \%$. This year,the sales of the firm Apple are five times that of Samsung. What percentage of the total market sales did Samsung account for last year,if the total sales remained constant over the two-year period (in $\%$)?

$x \%$ of $y + ? \%$ of $x = x \%$ of $(x + y)$

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