rose bud

i have tried this, and apparently this is not the method, is there another way?

my answers are a little different because the numbers changed, i got 12.7% for CuS and 75.83% for Cu2S. it almost added to my needed percent of 88.56%. i even tried to recalculate, incause i left out some numbers, but it didn't work, maybe i will try agai...