1) For Loan A we need to find 3 month PD ,1-(1-3 month PD)^4=1 year PD =>3 month PD=1-(1-1 year PD)^(1/4)=1-(1-.025)^(1/4)=.00631 =>EL(3mnths)=.00631*50%=.3155%
Loan B: 9 month PD=1-(1-1 year PD)^(.75)=1-(1-.011)^(.75)=.00826=>EL(9mnths)=.00826*65%=.5369%
Loan C: 6 month PD=1-(1-1 year PD)^(.5)=1-(1-.01)^(.5)=.0050=>EL(6 mnths)=.0050*60%=.30%
Loan D: 12 month PD=1-(1-1 year PD)^(1)=1-(1-.0075)^(1)=.0075=>EL(12mnths)=.0075*50%=0.375%
Thus the Loan C has the lowest credit risk with the lowest EL of .30%.
thanks