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

Let the price of the air cooler before VAT was added be "x".

We know that the price including VAT was Rs 3300, and the VAT was 10%

$\mathrm{x}+\frac{10}{100}\mathrm{x}=3300$

$\mathrm{x}+0.1\mathrm{x}=3300$

$1.1\mathrm{x}=3300$

$\mathrm{x}=\frac{3300}{1.1}=\mathrm{Rs} 3000$

So, the price of the air cooler before VAT was added = Rs 3000.