How do i find number of Cycles of a processor?

Question

I am kind of confused on how to find the number of cycles. Although it appears to be pretty simple.

Is it supposed to be number of cycles = (Clock Rate) * (CPI) * (Time)

or

number of cycles = (Clock Rate) * (Time)

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This is the question: If the processors each execute a program in 100 seconds, find the number of cycles and the number of instructions for each processor

i saw 2 solutions which made me confused, that's why i need your help