Sql Query Problem

Question

Hi I have an Sql Table Like this


My Table

StudentID   paidId   Amount
1140          25        100
1140          25        200 
1140          25        300
1141          30        500



I Want A table in Following format

i want To show Amount in This format
How I can Get a result Like

 
StudentID   paidId   Amount
1140          25        600
1141          30        500