I invested total 83
90% of the earnings are from bots. Also you have to factor in the curator rewards goes to bots. You can check my profile on https://steemworld.org/@guggis scroll down and you will see a post section. Lot of statistics are there.
Regards to 50/50 is a very basic concepts in steemit. If you go to your settings and scroll down and you will see this option. What ever you earn doesn't matter if you use bot or not, 50% will go to steem power. To get an idea about steem power, please read one of my post "The power of steem power". You can withdraw steem power it in 13 installment.
Yes it will go to trending if you have enough money on your post. Trending requires more money to be send to bots and if the post is good you can make a lot of money. But making it the hot list is easier than trending.
Let me know any more questions and clarifications. I'll be happy to help.
Thanks @guggis most of my doubts are cleared for now