$\frac{(469+174)^{2}-(469-174)^{2}}{469 \times 174} = ?$

What is the value of $\frac{(1.2)^{3}+(0.8)^{3}+(0.7)^{3}-3(1.2)(0.8)(0.7)}{(1.2)^{2}+(0.8)^{2}+(0.7)^{2}-(1.2)(0.8)-(0.8)(0.7)-(0.7)(1.2)}$?

What approximate value will come in place of the question mark $(?)$ in the given question? (You are not expected to calculate the exact value)
$71.98 \%$ of $1200 + 35.06 \%$ of $270 = ? \%$ of $600$

Which of the following is the $CORRECT$ rationalised form of $\frac{15}{\sqrt{5}+2} ?$

If $n = 7 + 4 \sqrt{3}$,then the value of $\left(\sqrt{n} + \frac{1}{\sqrt{n}}\right)$ is

Seema bought $20$ pens,$8$ packets of wax colours,$6$ calculators,and $7$ pencil boxes. The price of a pen is $Rs. 7$,a packet of wax colour is $Rs. 22$,a calculator is $Rs. 175$,and a pencil box is $Rs. 14$ more than the combined price of one pen and one packet of wax colours. How much amount did Seema pay to the shopkeeper? (in $Rs.$)