$\frac{3}{23}$ of $\frac{5}{12}$ of $1104 = ?$

What is the value of $\left(\frac{3}{5} + \frac{7}{9}\right)$?

$(0.88 \times 880 \div 8) \times 6 = ?$

The price of commodity $X$ increases by $40 \text{ paise}$ every year,while the price of commodity $Y$ increases by $15 \text{ paise}$ every year. If in $2001$,the price of commodity $X$ was $Rs. 4.20$ and that of $Y$ was $Rs. 6.30$,in which year will commodity $X$ cost $40 \text{ paise}$ more than commodity $Y$?

There is a number consisting of two digits. The digit in the units place is twice that in the tens place,and if $2$ is subtracted from the sum of the digits,the difference is equal to $1/6^{\text{th}}$ of the number. The number is:

If $64$ is subtracted from a number,then it reduces to $36 \%$ of itself. What is $\frac{4}{5}$ of that number?