Price of 1 shirt = $ y, therefore price of 5 shirt= $5y .
And amount left in bank = $184
And total amount Nikolas have = $240
So we get,
5y+184 = 240
Subtracting 184 from both sides
5y = 56
Dividing both sides by 5
y = 11.20
So price of each shirt = $11.20