sorting and adding columns

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Old 03-05-2012
sorting and adding columns

i have a file with two columns, and i want to uniquely sort the values in fist column and add the corresponding values in the second columns
file a contents

tom 200
john 300
sow 500
tom 800
james 50
sow 300

output shpould be in file b as
tom 1000
john 300
sow 800
james 50

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