Answer:
b. 8%.
Step-by-step explanation:
The effective interest rate can be determined using the rate function in excel as shown below:
=rate(nper,pmt,-pv,fv,type)
nper=period of license=4 years
pmt=27956
pv=-100000(the initial value of the license)
fv=0
type=1(1 for beginning payments, 0 for end of the period payments)
=rate(4,27956,-100000,0,1)
rate=8.00%