Sumita bought a microwave at $₹22,400$, including GST at the rate of $12\%$. Find the original price of the microwave, excluding GST.

 Find $2.5\%$ of $70$.

Find the loss $\%$ when a man loses $₹315$ by buying a ceiling fan for $₹1,260$.

The length of $18$ pieces of ribbon joined together is $540 cm$. Find the length if $30$ such pieces of ribbon are joined together.

 A tractor needs $10.8 litres$ of diesel to cover a distance of $555 km$. Find the distance covered if it had $21.6 litres$ of diesel.

 A student buys $10$ pens for $₹90$ and sold them at $₹12$ each. Find his profit $\%$.

An article was sold for $₹880$ after offering a discount of $12\%$ on its marked price. Find its marked price

. A person sells an old machine for ₹550, gaining ${\frac{1}{10}}^{th}$ of its cost price. Find the gain% .