If $\mathrm{GST}$ is included in the price, find the actual price of the following.

Item	GST%	Bill amount (in ₹)	Original Price (in ₹)
Pressure Cooker	$12 \%$	$₹ 3,360$

If $\mathrm{GST}$ is included in the price, find the actual price of the following.

A Cellphone Company fixed the price of a cellphone as $₹ 4500$. A dealer purchased a cell phone on which he paid $12\% \mathrm{GST}$ additionally. How much did the dealer paid as $\mathrm{GST}$? What is the purchase price of Cellphone?

A Super-Bazar prices an item in rupees and paise so that when $4\%$ sales tax is added, no rounding is necessary because the result is exactly in $‘n’$rupees, where $‘n’$ is a positive integer. Find the smallest value of $‘n’$.

Find the number of conversion times the interest is compounded and the rate for the sum taken for $1\frac{1}{2}$ years at $8\%$ per annum which is compounded half-yearly.

Find the number of conversion times the interest is compounded and the rate for the sum taken for $2$ years at $4\%$ per annum which is compounded half-yearly.

What will happen to the rate if the interest is compounded quarterly? And how many conversion periods will be there?