Math question about my grade

Question

If i have an overall grade of 92 for everything. But got a 77 in my final exam that’s worth 30% of my grade. How much will my overall grade be including my final exam grade?

Answer 1

87.5.

.7(92) + .3(77) = 64.4 + 23.1 = 87.5 = overall grade including the final exam

if the final is worth 30%, then the other oveall grade is worth 100-30 = 70%

30% = .3, 70% = .7