of net sales, SG&A expenses increased 50 basis points to 44.0% for the three months ended April 30, 2022, compared to 43.5% for the three months ended May 1, 2021. The increase in SG&A expenses as a percentage of sales was primarily due to growth of the concessions business and increases in marketing and other expenses, including expenses related to strategic investments to support continued growth of the business. While we experienced higher wage rates for our employees for the three months ended April 30, 2022, the increase in SG&A expenses as a percentage of net sales was partially offset by labor optimization measures taken by the Company, including the management of hours, resources and resulting wage rates.
Depreciation and amortization
Depreciation and amortization increased $0.7 million, or 4.3%, to $17.6 million for the three months ended April 30, 2022, compared to $16.9 million for the three months ended May 1, 2021. This increase was primarily driven by additional capital spending related to store growth and technology investments in fiscal year 2021 and the three months ended April 30, 2022, compared to previous fiscal years.
Other income, net
Other income, net increased $1.1 million, or 223.3%, to $1.6 million for the three months ended April 30, 2022, compared to $0.5 million for the three months ended May 1, 2021. This increase was primarily driven by an increase in franchise fees for the three months ended April 30, 2022, compared to the three months ended May 1, 2021.
Operating income (loss) before reorganization items, loss (gain) on derivative liability, interest and income taxes
As a result of the items discussed above, operating income (loss) was 12.0% of net sales, or $43.7 million, for the three months ended April 30, 2022, compared to 5.0% of net sales, or $13.7 million, for the three months ended May 1, 2021.
Reorganization items, net
Reorganization items, net increased $0.1 million, or 75.7%, to $0.1 million for the three months ended April 30, 2022, compared to $0.0 million for the three months ended May 1, 2021.
Loss (gain) on derivative liability
Gain on derivative liability increased $44.4 million, or 121.6%, to $80.8 million for the three months ended April 30, 2022, compared to $36.4 million for the three months ended May 1, 2021. This increase was primarily driven by a rise in interest rates during the three months ended April 30, 2022 and changes in management’s assumptions about the decreased likelihood of an initial public offering or a change in control event occurring in the future that would result in mandatory conversion of the Company’s Redeemable Series A Preferred Units into Common Units. These assumptions are key inputs to the Black-Scholes model used to measure fair value of the derivative liability. See Note 6, “Redeemable Series A Preferred Units,” and Note 8, “Fair Value Measurements,” of our unaudited interim condensed consolidated financial statements included elsewhere in this prospectus for more information regarding the derivative liability.
Interest expense, net
Interest expense, net decreased $0.5 million, or 4.9%, to $9.3 million for the three months ended April 30, 2022, compared to $9.8 million for the three months ended May 1, 2021. This decrease was
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