Item 3. Quantitative and Qualitative Disclosures About Market Risk
Item 3. Quantitative and Qualitative Disclosures About Market Risk.           
 
Cash                      
 
We have historically invested our cash and cash equivalents in money market funds or short-term, fixed rate, highly rated and highly liquid instruments which are generally reinvested when they mature. Although these existing investments are not considered at risk with respect to changes in interest rates or markets for these instruments, our rate of return on short-term investments could be affected at the time of reinvestment as a result of intervening events. As of September 27, 2020, Nathan’s cash and cash equivalents aggregated $81,519,000. Earnings on this cash would increase or decrease by approximately $204,000 per annum for each 0.25% change in interest rates.
 
Borrowings
 
At September 27, 2020, we had $150,000,000 of 2025 Notes outstanding which are due in November 2025. Interest expense on these borrowings would increase or decrease by approximately $375,000 per annum for each 0.25% change in interest rates. We currently do not anticipate entering into interest rate swaps or other financial instruments to hedge our borrowings.
 
Commodity Costs
 
We do not believe that general inflation has materially impacted earnings since 2006. However, we have experienced significant volatility in our costs for our hot dogs and certain food products, distribution costs and utilities. Between April 2018 and March 2020, beef prices traded within a range of + or - 10%. Prices were at the lowest levels between October 2018 and March 2019 as compared to higher levels between October 2019 and March 2020. Our average cost of hot dogs between October 2019 and March 2020 was approximately 11.2% higher than between October 2018 and March 2019. Our average cost of hot dogs between October 2019 and September 2020 was approximately 9.4% higher than between October 2018 and September 2019.
 
Beginning in May 2020, the cost of hot dogs has increased significantly due primarily to the effects of the COVID-19 pandemic on the meat processing industry.
 
We are unable to predict the future cost of our hot dogs and expect to experience price volatility for our beef products during fiscal 2021. To the extent that beef prices increase as compared to earlier periods, it could impact our results of operations. In the past, we entered into purchase commitments for a portion of our hot dogs to reduce the impact of increasing market prices. Our most recent purchase commitment was completed in 2016 for approximately 2,600,000 pounds of hot dogs. We may attempt to enter into similar purchase arrangements for hot dogs and other products in the future. Additionally, we expect to continue experiencing volatility in oil and gas prices on our distribution costs for our food products and utility costs in the Company-owned restaurants and volatile insurance costs resulting from the uncertainty of the insurance markets.
 
With the exception of purchase commitments, we have not attempted to hedge against fluctuations in the prices of the commodities we purchase using future, forward, option or other instruments. As a result, we expect that the majority of our future commodity purchases will be subject to market changes in the prices of such commodities. We have attempted to enter sales agreements with our customers that are correlated to our cost of beef, thus reducing our market volatility, or have passed through permanent increases in our commodity prices to our customers that are not on formula pricing, thereby reducing the impact of long-term increases on our financial results. A short-term increase or decrease of 10.0% in the cost of our food and paper products for the twenty-six week period ended September 27, 2020 would have increased or decreased our cost of sales by approximately $1,310,000.
 
Foreign Currencies
 
Foreign franchisees generally conduct business with us and make payments in United States dollars, reducing the risks inherent with changes in the values of foreign currencies. As a result, we have not purchased future contracts, options or other instruments to hedge against changes in values of foreign currencies and we do not believe fluctuations in the value of foreign currencies would have a material impact on our financial results.
 
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