Process Yield

$1$a$.$ For $2$ process steps, each with $5\%$ fraction defective, what is our final Process Yield? Hint: Process Yield for a process with $n$ steps and fraction defective, $p,$ at each step $=(1-p{)}^n$

$1$b$.$ For $4$ process steps, each with a yield of $25\%,$ what is our final Process Yield?

Hint: here $1-p=0\mathrm{.}25$