Thank you for your reply. Honestly for my negligence, time passing no loss happened to the company. As far I know. Otherwise they would give me a show-cause. Yes some mistakes happened but those were not due to time pass. And i would like to say here no matter how much time I passed or not I completed my task with in the time period. Like you assigned me a task to complete in 4 days. May be first 2 days I worked less and did some time pass, personal business but last 2 days I completed the task. So ultimately after 4 days the task you assigned me is done. Am I blameworthy in such cases too? 
I can not give the company the money back. I mean it is not possible for me to approach them with such an offer. Will it be ok if i give the estimated money to charity, some needy person, someone who needs help for treatment etc (muslim
, non muslim both people)?
What about the profit that I gained by using my salary in business. Can I keep that or need to give away a portion of it also.