Alternative to early settlement discount

Q: Will it be permissible for one to make an agreement with the supplier, at the onset before purchasing, that for example, the terms will be 30 days with a discount of 5%? There are a few suppliers with whom we have an agreement such as the one described above and we keep to the arranged terms. However, the time period and discount differs from supplier to supplier. If this is not permissible, then what is the solution to rectify the situation?

Choosing a life partner

Q: During the passed month of Ramadhaan, I engaged myself in dua few minutes before iftaar time. I asked Allah for indication for a suitable spouse, immediately after terminating the dua, my parents mentioned a girl to me. Should I accept this as an answer? What would be a permissible means to initiate a marriage proposal. It is to be noted that I do not know who this girl is. I have met her father a couple of times before, but just in passing.