Interest rates on debt depending on capital structure

I am doing an assignment on capital structure and I am trying to estimate the optimal capital structure for a company. In order to do so, I need interest rates on debt depending on the percent of firm financed with debt. Can someone help me with the interest rates? I would require a total of 7 interest rates for 0% - 60% of debt financing. The company is S&P 'A' rated. I live in Southeast Europe and the company I am using for the assignment is from the US so any help would be highly appreciated.

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Interest rates on debt depending on capital structure

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Interest rates on debt depending on capital structure

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