Explanation

 1/4 of 1/2 of 1/5 of 200

= 1/4 of 1/2 of  [(1/5) × 200]

= 1/4 of 1/2 of  40

= 1/4 of  [(1/2) × 40]

= 1/4 of 20

= (1/4) × 20

= 5