A particular test program performs 1000 tests, most of which cause little or no yield loss. Seven measurements account for most of the yield loss. The yield loss due to each measurement is found to be: Test #1: 1.1%; Test #2: 6%; Test #3: 3.3%; Test #4: 8%; Test #5: 2%; Test #6: 2%; Test #7: 3%; all other tests: 1%. What is the overall yield of this lot of material?