Answer:
(Fatwa: 1389/1304=D/1429)
It is unlawful to guarantee payment of 30%. It is not right to deal in such way, such dealing involves interest.
(2) You can perform tahajjud after Isha salah before going to bed, you will get the reward. However, it is better to perform tahajjud after midnight having slept for awhile.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
