Can you please show step by step and also how to do it on HP financial calculator.

This information will be used for two questions!

Sand Key Development Company has a capital structure consisting of $20 million of 10% debt and $30 million of common equity. The firm has 500,000 shares of common stock outstanding. Sand Key is planning a major expansion and will need to raise $15 million. The firm must decide whether to finance the expansion with debt or equity. If equity financing is selected, common stock will be sold at $75 per share. If debt financing is chosen, 6% coupon bonds will be sold. The firm's marginal tax rate is 34%. Determine the level of operating income at which Sand Key would be indifferent between debt financing and equity financing.

the answer is $5,150,000 but idk how to do it