The Norwood Tigers are having team shirts made. One option is to pay Harold's Tees a $41 setup fee and then buy the shirts for $10 each. Another option is to go to City Printing, paying $36 for a setup fee and an additional $15 per shirt. The team parent in charge of the project notices that, with a certain number of shirts, the two options have the same cost. What is the cost? How many shirts is that?