Answer:
5.87%
Explanation:
In order to find out the after tax cost of debt first we have to determine the rate after applying the rate formula which is shown below:
Given that,
Present value = $892
Future value or Face value = $1,000
PMT = 1,000 × 6.4% = $64
NPER = 21 years
The formula is shown below:
= Rate(NPER;PMT;-PV;FV;type)
The present value come in negative
So, after solving this,
1. The pretax cost of debt is 7.43%
2. And, the after tax cost of debt would be
= Pretax cost of debt × ( 1 - tax rate)
= 7.43% × ( 1 - 0.21)
= 5.87%