The following represents the financial information for Domingo Corporation for two months:

March April

Sales revenue $ 490,000 $ 440,000

Costs Process inspection $ 1,650 $ 1,880

Scra 1,850 1,930

Quality training 19,800 13,000

Warranty repairs 4,300 4,800

Testing equipment 7,000 7,000

Customer complaints 2,800 3,400

Rework 17,000 18,500

Preventive maintenance 13,500 9,500

Materials inspection 6,500 4,800

Field testing 9,400 12,400

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).