For 2021, MSU Corporation has $500,000 of adjusted taxable income, $22,000 of business interest income, and $120,000 of business interest expense. It has average annual gross receipts of more than $26,000,000 over the prior three taxable years. a. What is MSU's interest expense deduction for 2021? b. How much interest expense can be deducted for 2021 if MSU's adjusted taxable income is $300,000