At the beginning of its current fiscal year, TRE Co. issued $500,000 of 8%, 15-year bonds at a premium of $45,320. Interest is payable annually. Assuming that the effective interest method is used and that the yield rate is 7%, the unamortized premium at the beginning of the next year is approximately.. a. $47,148 b. $38,172 c.43,492 d. $41,828