Coudl you help me with the present value of the tax shield? is 14.15?

Assume that Microsoft has a total market value of $303.9 billion and a marginal tax rate of 35%. If it permanently changes its leverage from no debt by taking on new debt in the amount of 13.3% of its current market value, what is the present value of the tax shield it will create? The present value of the tax shield is $ billion