i think it is not so difficult to earn o.1 bitcoin from in a week. if you invest your money in alt coin then you can really earn o.1 bitocin may be more just in a week. i seen such kind of people who earn 0.5 bitocin in a week.
yes. but generating 0.1btc a week is not easy. and it is not the work of first week... if you are talking about trading then it probably need you to learn all trading skills. and if you are talking about ICO's then this also need at least a month or so to return your invest.