Question

an electric firm finds that 4% of its resistors are defective. how many resistors do they have to make to deliver 5000 resistors?

Answer 1

Answer is 5000 resistors, the quesiton never said that they had to deliver working resistors

but if you wanted 5000 working resistors
the rest is working
100%=all
all-defective=working
100-4=96
96%=working
working=5000
find 100%
96%ofall=5000
percent means parts out of 100
96/100ofall=5000
times both sides by 100
96ofall=500000
divide both sides by 96
all=5028.33333
round up
5029 resistors must be made to deliver at least 5000 working ones