Question 14 (4 points) The product life characteristics curve has three distinct time periods (also called phases). The 'useful life' phase of a product starts at 20 hours and ends at 1020 hours. Up to how many hours (optimum) should the company test for the failure of the product before selling it to its customers if the company wants to minimize repair/warranty costs of the sold products in the field? Assume repair/warranty costs are much higher compared to the cost to perform test for failure. 1500 01020 20 10 5