How can you earn 40 dollars a day in bitcoin?? , let's share the knowledge on this topic , and hopefully we get more success after share my experience in here
If you want make big then you need to invest also big because all this depends upon you that how much you want make and how much you can invest .
If you can do short term trading then you can make daily easily 100-200$ but you will needed big amount of investment ( usually in day trading we neee to select one coin which has better popularity and is down at that time by 4-5% , and after buy that coin has much chances to increase 2-3% , so investment is big then profit also will be big ) .
But if you want make earnings with 40-50$ daily with very low investment then i don't think that it is possible because low investment and any work with low money always results into lack of profit only and if you will make your profit multiple times then still you will not be satisfied with your earnings because your investment is less .
So think yourself that for how much you can make according to your investment amount .