By what percentage was the price increased

A shop owner increased the selling price of a shirt from $20 to $26. By what percentage was the price increased? Please discuss how you were able to get that answer.

Disclaimer: It is illegal to use the research material ordered on this website for other than research purposes. You must quote the sources appropriately. The company bears no responsibility for the use of research work, not intended for education use, the work is sold as-is with the highest quality and service available and written by freelancers.