$40 a day is not a joke, you really need a skill to get it here in this forum, you can earn it by campaigns and other micro tasks or by simply spamming the whole place. But in trading and if you have something to invest, it won't be hard.
Most of the jobs that I know that could make you earn that big needs a capital, otherwise, you'll have a hard time squeezing your self and resources(internet and electricity) to get your goal.