(a). During 2013, Saiton Co introduced a new line of machines that carry a three-year warranty against manufacturer's defects. Based on industry experience, warr anty costs are estrmated at 3% of sales in the year of sale, 3% in the year after sale, and 4% in the second year after sale. Sales and actual warranty expenditures for thr first three-year period were as follows. Calculate the warr anty expense for 2015 ( 5 points) Calculate the ending balance of warranty liablity at December 31, 2015 ( 5 points) (b) Muggs Co uncludes one coupon in each bag of dog food it sells. In return for 4 coupons, customers receive a leash The leathes cost Muggs $1 each Muggs estimates that 50 percent of the coupons will be redeemed. Calculate the premrum expense for 2014 (5 points) Calculate the premium liability at December 31.2014 (5 points)