What is the Stella's total percentage grade given that the first 5 exams contribute 80% and the final exam contributes 20%. In the exams she scored 80%, 82%, 84%, 66% and 64% and in the final 83%.

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Stella has 6 exams in all. The weight-age of the first 5 exams is 80% or the weight-age of each exam is 16% and the final exam has a weight-age of 20%.

As she scores 80% in exam 1, it contributes 0.16*0.80 = .128

82% in exam 2 contributes 0.16*0.82 = .1312

84% in exam 3 contributes 0.16*0.84 = .1344

66% in exam 4 contributes 0.16*0.66 = .1056

64% in exam 5 contributes 0.16*0.64 = .1024

and 83% in the final exam contributes 0.2*0.83 = .166

Adding all 0.128 + 0.1312 + 0.1344 + 0.1056 + 0.1024 + 0.166 = 0.7676 = 76.76%.

**The total grade percentage of Stella is 76.76%**

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