You are analyzing return policy for a company. It is estimated that 10% of products have a soft- ware defect while 1% have a hardware defect (you can disregard cases with both types together). You also evaluated that 80% of customers who bought a devise with a hardware defects defect will return it, while return rate for software defects is 40%. Additionally, 5% of customers with func- tioning devises will return theirs as well. What is the proportion of returned devises which are fully functional