please explain how this answer was caculated using a caculator

4. CF Company has a capital structure of debt of $300,000 and equity of $700,000. The company's unleveraged beta (Bu) is 1.0, and its tax rate is 40%. What would be CF Company's leveraged beta (B.)? Bl=Bu[1 + (1 - 1)(D/E)] = 1.0[1 + 0.6(300,000/700,000)] = 1.26