Loan write-offs almost quadrupled in the first quarter of the year on the back of the central bank’s easing of rules, in a sobering reminder of the banking sector’s deteriorating financial health.    Between January and March, Tk 557.30 crore was written-off, in contrast to Tk 141.26 crore a year earlier, according to data from Bangladesh Bank. Earlier in February, the central bank revised its policy to allow banks to write-off default loans that have been languishing in the bad category for three years, down from five years previously.