The given details are,
Total number of runs scored by cricketer = 120
(i) 20% of Runs scored in 6’s = (20/100) × 120 = 24 runs
(ii) 30% of Runs scored in 4’s = (30/100) × 120 = 36 runs
(iii) 25% of Runs scored in 2’s = (25/100) × 120 = 30 runs
(iv) Runs scored in singles = 120 – (24+36+30)
= 120 – 90 = 30 runs
Percentage of shots scoring ones = (Runs came in singles/Total runs scored) × 100
= (30/120) × 100
= 25%