How much should I sell my iPhone 4S 16G?

I recently lost my iPhone that I just bought in march, it was taking way too long
to turn up so I just filed a claim with my insurance company, payed a deductible and ordered a new one. Well today the phone turned back up. I obviously don't need two phones so I'm selling it to a friend. Friend's asking for how much and I want to say 100. I still have the box it came in and it's in very good condition.

How much money does it take to repair an iphone?

My parents were making me mad and i was tossing stuff around the house and i ended up tossing my iphone into the wall. It didn't break just a crack and still works fine, but i would like to be fixed. They arent getting me another one right now cuz its too expensive.

Correct my English grammar please?

I sent out couple more emails this morning to other sellers, but so far I see Angela has the best offer for us and she has a lot of oem stuff for iphone/ipad and mac.

Will sending a demo to a label at 14 years old be taken seriously?

I want to send to a few indie labels. None of the big 4. Sub Pop, XL, 4AD, a few more. I've written about 100 songs and I've picked 3 of my best and done a rough recording on voice memos on iPhone. Would they be taken seriously since I'm only 14? Or would the voice memos not be taken seriously? I can't afford pro tools, unfortunately, but I believe I have a lot of potential and a lot to offer. Any other advice?

I can't unlock my iphone 4

I was playing around with my settings, and I think i turned on voiceover… Or something like that. Then my phone started talking to me and it freaked me out, so I did what any sane person would do and I pressed the power button. That stopped the phone from talking to me, but when I tried to unlock it again there was a grey box in the upper left hand corner and my touchscreen wouldn't work… So I can't unlock my phone. If anybody with an iphone thinks they have any idea what's going on can you Please help me?

How to get a mac to show iphone apps in App Store?

When I first got my mac it showed the iPhone and iPad apps and now every time I try to use the app store it doesn't show them. How do i get it to show the iPhone apps?

Added (1). I no longer have the iPhone