$[(7.98)^{2} - (13.002)^{2} + (4.02)^{3}]^{2} = ?$

Which of the following sequences is in descending order of their values?

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 $Y$?

In a two-digit number, if it is known that its unit's digit exceeds its ten's digit by $2$, and that the product of the given number and the sum of its digits is equal to $144$, then the number is

How many numbers between $150$ and $500$ are divisible by $2, 3,$ and $7$ together?

$8000 \div 16 - 200 = ? \times 6$