i knew how to do this but now i forgot the steps, can someone explain it to me?

The probability that a customer spends 10+ hours or have below $40,000 is 0.6034
Let A represent spending 10+ hours, and B represent having below $40,000
The probability is then calculated using:
P(A or B) = P(A) + P(B) = P(A and B)
This gives
P(A or B)= (476 + 621 - 131)/1601
Evaluate the sum and difference
P(A or B)= 966/1601
Divide
P(A or B)= 0.6034
Hence, the probability is 0.6034
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