By Noor Zainab Hussain, Manya Saini and Carolina Mandl (Reuters) -Wells Fargo on Friday posted higher fourth-quarter profit, beating analysts’ expectations as it cut costs. But the lender warned that its net interest income (NII) could fall 7% to 9% this year, sending shares down more than 3%. “We expect net interest income to decline from the high levels we saw as rates were rising last year,” CEO Charlie Scharf told analysts. While the implied path for interest rates could weigh on the bank’s NII, “significant uncertainty exists regarding eventual timing and extent of Federal Reserve interes…