fix decimal float/str error on dev

mkt/stats/search.py

@@ -224,7 +224,8 @@ def cut(revenue):
     """
     Takes away Marketplace's cut from developers' revenue.
     """
-    return Decimal(str(round(Decimal(revenue) * Decimal(MKT_CUT), 2)))
+    return Decimal(str(round(Decimal(str(revenue)) *
+                   Decimal(str(MKT_CUT)), 2)))
 
 
 def handle_kwargs(q, field, kwargs, join_field=None):