On January 1, 2015, the Mayfield Corporation issued $500 million of zero-coupon debentures, due December 31, 2025. The proceeds of the bond sale totaled approximately $192.772 million. Assuming semi-annual compounding, estimate the effective interest rate on the zero-coupon debentures. Calculate the interest expense incurred by the Mayfield Corporation during the first year that the debt was outstanding.

Calculate the interest expense incurred by the Mayfield Corporation during the first year that the debt was outstanding. State your answer in $ millions and round your answers to one decimal place.