To check on shipment of 500 articles a sampling of 50 articles was carefully inspected of the sample 4 articles were defective on this basis what is the probable percentage of defective articles in the original shipment

Answer 1

If 4/50 articles is defective, how many would be defective out of 500?
Easy peasy.
4 × 10 = 40
— —
50 × 10 = 500

Answer 2

Whoops, the second slash is supposed to be under the 40, sorry!

Answer 3

4/50 = x/500
x = 40
Convert 40/500 to a percentage.