if you have a total of 779 and 576 is completed what is 90%.
I'm not sure if I understand your question. But, if you have completed 576 out of 779, that means you have completed: 576 / 779 =0.7394 x 100 =73.94%
If you want to complete 90%, then:
90% x 779 = 0.90 x 779 =~701, which is about 90% of 779.
I hope that answers your question.