should we use the real rate or money rate for getting EAC if qusetion says to ignore inflation and t

should we use the real rate or money rate for getting EAC if question says to ignore inflation and taxation

for example i have this question named sassone plc
in this question says
“using Equivalent annual cost and considering machine purchase prices and maintainance cost determine which machine should be purchased by sassone plc Ignore taxation and inflation”

when it comes to the answer we all know that if the cash flows are not inflated we use the real cost of capital to solve the question
But in the solution of this question the examiner is using the nominal rate of cost of capital

plz help me clear this part of the question
here is the link to the question
https://www.scribd.com/doc/55467253