A shirt was originally priced at ₹600. It is now on sale for ₹540. What is the percentage decrease in the price?

A shirt was originally priced at ₹600. It is now on sale for ₹540. What is the percentage decrease in the price?
एक शर्ट की कीमत मूल रूप से ₹600 थी। यह अब ₹540 में बिक्री पर है। कीमत में कितने प्रतिशत की कमी हुई?