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determining probability of scoring 80

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Jessica must finish two courses (much like myself), statistics and economics, in order to complete the requirements for a BA degree. All along she has maintained an 80% average. She has calculated probabilities of scoring in the remaining two courses as follows:

Probability of scoring 80 in Statistics= 0.80
Probability of scoring 80 in Economics= 0.40
Probability of scoring 80 in both= 0.30

What is the probability that she will score 80 in at least one of her courses? What is the probability that she will NOT score 80 in either course?

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The solution assists with determining probability of scoring 80 in Statistics, scoring 80 in Economics, and both is given.

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a) What is the probability she will score 80% in at least one of her courses?
b) What is the probability she will NOT score 80% in either course?
a) I think one difficulty with this question is the wording. I take 'at least one' to ...

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