Code:
$ awk '{ sub(/%/, "", $4); A[$7] += ($3 * (100-$4))/100; } END { for(X in A) printf("%s, %d MB USED\n", X, A[X]) }' datafile
/usr/sap/transBWJ, 45158 MB USED
/usr/sap/ED1, 126 MB USED
/logs, 225 MB USED
/fixes, 35553 MB USED
/usr/sap/BX2/ASCS13, 952 MB USED
/usr/sap/EX1/ERS19, 880 MB USED
/usr/sap/hostagent_depot, 773848 MB USED
/var/adm/ras/livedump, 253 MB USED
/usr/sap/BD3/ASCS08, 890 MB USED
/tmp, 2027 MB USED
/usr/sap/EX1/W17, 696 MB USED
/usr/sap/WX1/ERS81, 819 MB USED
/proc, 0 MB USED
/var, 456 MB USED
/usr/sap/ED1/ERS04, 829 MB USED
/db2, 1013 MB USED
/sapmnt/BD3, 245366 MB USED
/archive, 217055 MB USED
/usr/sap/BD3/ERS09, 778 MB USED
/usr/sap/DAD, 4300 MB USED
/sapmnt/WX1, 245366 MB USED
/usr/sap/BD3, 126 MB USED
/, 201 MB USED
/sapmnt/EX1, 245366 MB USED
/cn_dev, 217055 MB USED
/IBMperfpmr, 1843 MB USED
/appl/rec, 217055 MB USED
/usr/sap/WX1, 126 MB USED
/usr, 883 MB USED
/usr/sap/EX1, 126 MB USED
/audit, 486 MB USED
/usr/sap, 4915 MB USED
/home, 486 MB USED
/usr/sap/BX2/ERS14, 808 MB USED
/opt, 87 MB USED
/admin, 126 MB USED
/usr/sap/EX1/SCS18, 665 MB USED
/usr/sap/WX1/W79, 706 MB USED
/appl/cyb_agent, 145 MB USED
/usr/sap/transBW, 45158 MB USED
/usr/sap/WX1/SCS80, 399 MB USED
/sapmnt/BX2, 245366 MB USED
/usr/sap/ED1/SCS03, 573 MB USED
/usr/sap/BX2/W12, 2764 MB USED
/usr/sap/BD3/W07, 2856 MB USED
/usr/sap/BX2, 126 MB USED
/sapmnt/ED1, 245366 MB USED
/usr/sap/ED1/W02, 696 MB USED
$