Nash Furniture Company started construction of a combination office and warehouse building for its own use at an estimated cost of $7,500,000 on January 1, 2020. Nash expected to complete the building by December 31, 2020. Nash has the following debt obligations outstanding during the construction period. Construction loan-12% interest, payable semiannually, issued December 31, 2019 $3,000,000
Short-term loan-10% interest, payable monthly, and principal payable at maturity on May 30, 2021 2,100,000
Long-term loan-11% interest, payable on January 1 of each year. Principal payable on January 1, 2024 1,500,000

Assume that Nash completed the office and warehouse building on December 31, 2020, as planned at a total cost of $7,800,000, and the weighted-average amount of accumulated expenditures was $5,400,000.

Required:
a. Compute the avoidable interest on this project.
b. Compute the depreciation expense for the year ended December 31, 2020.