Share a discussion several years ago between a friend and me

Share a discussion between a friend and me.

He asked for an EA with more than 5% profit rate per month.
I answered it’s impossible.
He sticked to make us develop one for him.
I can’t pledge to successfully develop an EA with such a high profit rate.

What do you think of it?

Your friend desired too much.
If possible to get 5% per month, why do we need to deposit in the bank?