After allowing two successive discounts of $15\%$ and $5\%$, a fan is sold for $₹ 2907$. What is the marked price of the fan $?$ If the marked price of the fan is $₹ k$, then find the value of $k$.

Applied to a bill of $₹ 15000$, what is the difference in rupees between a discount of $50\%$ and two successive discount of $30\%$ and $20\% ?$ 

(Write the answer without rupee symbol)

A steel almirah is quoted at $₹ 1100$. Sales tax at the rate of $7\%$ is charged extra. Find the amount of buyer has to pay for the almirah. 

If the required answer is $₹ k,$ then find the value of $k$.

Radha went to a departmental store and purchased the following articles.

(i) Bakery shop ( S.T. $@ 10\%$) worth $₹ 42$. 

(ii) Clothes ( S.T. $7\%$) worth $₹ 800$.

(ii) A pair of shoes (S.T.$7\%$) worth $₹ 200$.

(iv) cosmetics (S.T. $10\%$) worth $₹ 150$.

Find the amount she has to pay for the bill.