Pop Tent produces 13,400 tents of which 600 are spoiled units because the process, even though carefully and efficiently executed, is unable to produce good units 100% of the time. Another 50 units are spoiled because machines broke down and there also were operator errors. What is the normal spoilage rate (round to two decimal places) A. 4.85% O B. 0.37% O C. 4.48% O D. 4.71%