diff --git a/half/__init__.py b/half/__init__.py
index f92c029..2602a50 100644
--- a/half/__init__.py
+++ b/half/__init__.py
@@ -18,32 +18,34 @@ def compiles():
 @check50.check(compiles)
 def simple():
     """Bill of $50, with 10% tax and 20% tip, creates output of $33.00"""
-    check_half(bill="50", tax="10", tip="20", expected="33.00")
+    check_half(bill="50", tax="10", tip="20", expected="$33.00")
 
 
 @check50.check(compiles)
 def decimal_tax():
     """Bill of $50, with 12.5% tax and 20% tip, creates output of $33.75"""
-    check_half(bill="50", tax="12.5", tip="20", expected="33.75")
+    check_half(bill="50", tax="12.5", tip="20", expected="$33.75")
 
 
 @check50.check(compiles)
 def rounding_up():
     """Bill of $100, with 12.5% tax and 15% tip, creates output of $64.69"""
-    check_half(bill="100", tax="12.5", tip="15", expected="64.69")
+    check_half(bill="100", tax="12.5", tip="15", expected="$64.69")
 
 
 @check50.check(compiles)
 def rounding_down():
     """Bill of $96.40, with 13% tax and 14% tip, creates output of $62.09"""
-    check_half(bill="96.40", tax="13", tip="14", expected="62.09")
+    check_half(bill="96.40", tax="13", tip="14", expected="$62.09")
 
 
 # Helpers
 def regex(input):
     """Match with any non-numeric characters on either end of input"""
-    return rf'^\D*\${re.escape(input)}\D*$'
+    return rf"^\D*{re.escape(input)}\D*$"
 
 
 def check_half(bill: str, tax: str, tip: str, expected: str):
-    check50.run("./half").stdin(bill).stdin(tax).stdin(tip).stdout(regex(expected), expected, regex=True)
\ No newline at end of file
+    check50.run("./half").stdin(bill).stdin(tax).stdin(tip).stdout(
+        regex(expected), expected, regex=True
+    )