Answer:
The correct answer is 9.56%
Step-by-step explanation:
Before tax cost of Debt = rate(nper,pmt,pv,fv) * 2 
 
nper = 25*2 = 50 
 
pmt = 1000*12%*1/2 = 60 
 
pv = 1230.51 
 
fv = 1000 
 
Before tax cost of Debt = rate(50,60,-1230.51,1000)*2 
 
Before tax cost of Debt = 9.56%