Percentage of bags on which coupons were placed
Monday - 24/120 × 100 = 20%
Tuesday - 32/130×100 =24.61≈ 25%
Wednesday - 38/155×100 = 24.51≈25%
Thursday - 35/160×100 =21.87≈22%
Friday - 40/135×100 = 29.62 ≈ 30%
As we can clearly see that there are 3 days on which employes placed the coupon for ≥25%.They are Tuesday, Wednesday, and Friday.