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

	March			April
Sales revenue	$	490,000		$	390,000
Costs
Process inspection	$	1,650		$	1,970
Scrap		1,820			1,940
Quality training		20,700			13,700
Warranty repairs		4,100			4,700
Product testing equipment		7,000			7,100
Customer complaints		2,900			3,600
Rework		16,000			17,500
Preventive maintenance		14,500			9,700
Materials inspection		6,500			5,000
Field testing		9,200			12,900

Required:

b. Calculate the ratio of the prevention, appraisal, internal failure, and external failure costs to sales for March and April.