Quality control issues - If the company's appraisal costs are $100,000, internal failure costs are $250,000, and external failure costs are $400,000, how to estimate total quality costs using the multiplier method?

a. $750,000 to $900,000
b. $500,000 to $600,000
c. $600,000 to $750,000
d. $900,000 to $1,000,000