Probability of Selecting a Defective Product

A company has two machines, Machine A and Machine B, that produce the same product. Machine A produces the product 70% of the time without defects, while Machine B produces it 80% of the time without defects. If a product comes from either machine, calculate the probability that the product has defects.

Assuming that both machines operate with equal frequency, what is the probability of selecting a defective product?