Sales Tax/Value Added Tax/Goods and Services Tax

Salim bought an article for $₹784$ which included GST of $12\%$. What is the price of the article before GST was added?

Waheeda bought an air cooler for $₹3300$ including a tax of $10\%$. Find the price of the air cooler before VAT was added.

The cost of a pair of roller skates at a shop was $₹450$. The sales tax charged was $5\%$. Find the bill amount.

I purchased a hair-dryer for $₹5400$ including $8\%$ VAT. If the price before VAT was added is $₹k$, find the value of $k$.

An article was purchased for $₹1239$ including GST of $18\%$. If the price of the article before GST was added is $₹x$, then find the value of $x$.

The price of a TV is $₹13,000$. The sales tax charged on it is at the rate of $12\%$. If the amount that Vinod will have to pay to buy it is $₹k$, then find the value of $k$.