BUENOS AIRES, April 20 (Reuters) - Argentina's central bank hiked the benchmark interest rate a sharper-than-expected 300 basis points on Thursday after inflation soared past expectations in March to hit 104% on an annual basis, the monetary authority said in a statement. The bank hiked the benchmark rate 300 basis points in March, the first raise since September at the end of a vicious tightening cycle through most of 2022. The bank had wanted to cut rates this year on hopes inflation would cool. Reuters reported earlier this month that central bank board members were discussing another interest rate hike to rein in one of the world's highest inflation rates. A central bank poll forecasts inflation will end this year at 110%, while J.P. Morgan estimates it could hit 130%.

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