Question: Clerk#000000936 dealt with a "Not Specified" order on 1995/3/13, what was the charge for the part of the order shipped by truck?
SQL: SELECT T2.l_extendedprice * (1 - T2.l_discount) * (1 + T2.l_tax) AS num FROM orders AS T1 INNER JOIN lineitem AS T2 ON T1.o_orderkey = T2.l_orderkey WHERE T1.o_clerk = 'Clerk#000000936' AND T2.l_shipmode = 'TRUCK' AND T1.o_orderstatus = '4-NOT SPECIFIED' AND T1.o_orderdate = '1995-03-13'