I. Given : C.P = Rs. 300.It gives no information about S.P or % loss.∴ I alone is not sufficient.II. Given : Loss = 25 % of S.PSince S.P is not given, loss can’t be determined.∴ II alone is not sufficient.I & II. C.P – S.P = 25% of SP=4SP​C.P=45​S.P⇒S.P=54​×300=Rs.240⇒ Loss =300−240=Rs.60.∴ I & II together are sufficient.