gst on final product if one raw material is exempt.

As per sec 15(1) value of supply of goods or services or boyh shall be the transaction value,which is the price actually paid or payable for the said supply of goods where buyer and seller are not related and price is the sole consideration.

In your case GST will be levied on whole amount of Rs 500.

There is no provision in law for valuation on different basis when your input is exempt.

As per sec 15(1) value of supply of goods or services or both shall be the transaction value,which is the price actually paid or payable for the said supply of goods where buyer and seller are not related and price is the sole consideration.

In your case GST will be levied on whole amount of Rs 500.

There is no provision in law for valuation on different basis when your input is exempt.

As per sec 15(1) value of supply of goods or services or boyh shall be the transaction value,which is the price actually paid or payable for the said supply of goods where buyer and seller are not related and price is the sole consideration.

In your case GST will be levied on whole amount of Rs 500.

There is no provision in law for valuation on different basis when your input is exempt.

Yes you will have to pay GST at 28% on your sale vale i.e in your case Rs 500.

You can claim input credit of taxable item.