in 2022, firm l purchased machinery costing $21,300 and elected to expense the entire cost under section 179. required: how much of the expense can firm l deduct if its taxable income before the deduction was $58,000. how much of the expense can firm l deduct if its taxable income before the deduction was $19,200. how much of the expense can firm l deduct if its net operating loss (nol) before the deduction was $5,016.