cost of debt in WACC... spoiler alert if you use Schweser

In Schweser practice test 1, question 20, why did they not include the tax effect of debt in calculating WACC? I thought the formula for WACC is %debt*cost of debt(1-tax rate) +%equity*cost of equity.

but in the answer they did just %debt*cost of debt +%equity*cost of equity. and they didn’t specify that the cost of debt in after tax in the body of the questions…

Maybe the cost of debt was already given on an after-tax basis?

I noticed the same and it was not clear at all that it was after-tax. This has to be a mistake.

It is a mistake look at the errrata page for schweser.