I only need part B. please explain.

The following represents the financial information for Domingo Corporation for two months. March $510,000 April $440,000 $ Sales revenue Costs Process inspection Scrap Quality training Warranty repairs Product testing equipment Customer complaints Rework Preventive maintenance Materials inspection Field testing $ 1,700 1,930 18,900 4,200 7,200 2,800 16,000 11,500 7,100 10,300 1,980 1,990 13,700 4,500 7,300 3,800 19,500 8,800 5,100 14,300 Required: a. Classify these items into Prevention, Appraisal, Internal failure, or External failure costs. b. Calculate the ratio of the prevention, appraisal, internal failure, and external failure costs to sales for March and April Complete this question by entering your answers in the tabs below. Required A Required B Calculate the ratio of the prevention, appraisal, internal failure, and external failure costs to sales for March and April. (Enter your answers as a percentage rounded to 1 decimal place (i.e., 32.1).) March 0.4% April 0.3% % Prevention Annraisal HI Score answer >