You are given a math word problem and you are supposed to only use subtraction on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Context: The Razorback shop makes $ 210 dollars off each jersey and $ 240 off each t-shirt. During the Arkansas and Texas tech game they sold 177 t-shirts and 23 jerseys.

Question: How much more does a t-shirt cost than a jersey?
30