On July 31, 2011, Robinson Company engaged Parrish Tooling Company to construct a special- purpose piece of factory machinery. Construction was begun on August 1, 2011 and was completed on November 1, 2011. To help finance construction, on July 31, Robinson issued a $450,000, 3-year, 10% note payable at Randazzo National Bank, on which interest is payable each July 31. Robinson paid $300,000 of the proceeds of the note to Parrish on July 31. The remainder of the proceeds was temporarily invested in short-term marketable securities at 8% until November 1. On November 1, Robinson made a final $150,000 payment to Parrish. Other than the note to Randazzo, Robinson's only outstanding liability at December 31,2011, is a $45,000, 6%, 6-year note payable, dated January 1,2008, on which interest is payable each December 31. a) Calculate (rounding your computations to the nearest dollar): 1. Interest revenue. 2. Weighted-average accumulated expenditures. 3. Avoidable interest