Write SQL query to solve given problem: What is the average price before discount of the top 10 orders with the highest total price?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT SUM(T2.l_extendedprice) / 10 FROM orders AS T1 INNER JOIN lineitem AS T2 ON T1.o_orderkey = T2.l_orderkey ORDER BY T1.o_totalprice DESC LIMIT 10