Letter Of Completion For Community Service Community Service Letter Of Proof/completion Towards Teacher?

Community Service Letter of Proof/completion towards teacher? - letter of completion for community service

Be offered in adolescence, in my private kindergarten, and requests for a letter he received 15 hours. How should it be like to write. For example, I have a letterhead? I think I should be formal. and how the state, how many hours he has done. Please answer thoroughly. and give me some advice please give more.