encryption - How to optimize convertions in encrypted SQL Server database table -

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i have encrypted database table , want select data calculations. lot of conversions needed , encrypt again update table. how can optimize query. sample query

select @total=cast(convert(varchar, decryptbykey([amount1])) numeric(12, 2))+ cast(convert(varchar, decryptbykey([amount2])) numeric(12, 2))*@percent table1  update table1 set [total]= encryptbykey(key_guid('key_67832'), convert(varchar,@total)) 

select cast(convert(varchar, decryptbykey([amount1])) numeric(12, 2)) amount1,        primarykey -- not sure if need this, added in case...   temptable   table1  select @total=amount1 + amount1 * @percent temptable  -- bit unchanged (so far) update table1 set [total]= encryptbykey(key_guid('key_67832'), convert(varchar,@total))

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