Finance Question help..Urgent

New York Waste (NYW) is considering refunding a $50,000,000, annual payment, 14% coupon, 30-year
bond issue that was issued 5 years ago. It has been amortizing $3 million of flotation costs on these
bonds over their 30-year life. The company could sell a new issue of 25-year bonds at an annual interest rate of 11.67% in today's market. A call premium of 14% would be required to retire the old bonds, and flotation costs on the new issue would amount to $3 million. NYW's marginal tax rate is 40%. The new bonds would be issued when the old bonds are called.What will the after-tax annual interest savings for NYW be if the refunding takes place?

I need help with the formula...