Keeping a clean heart

Q: Its been a while I'm having some confusion about my attitude whether its something one calls self respect or sort of pride or ego. I'm not able to differentiate between the two terms. I'm aware of the virtues of forgiving others and have positive thoughts for others yet at times, no matter how much I try, I cant let go off the feeling that somebody did that to me, hurt my sentiments, and how much I try to get away from such negativity, it comes back to my mind with even more potential. Like, I will think "Did you forget what was done to you? Do you still wanna go and meet them? They cant be your allies like the way they used to be before.

One thing I would like to clear, it's not that I'm an egoistic person, I forgive easily but maintain a distance, even if my heart is willing to get the same ties back. Is it a version of pride? I need advice regarding my behavior towards such attitudes of people, even of close friends!

Early settlement discount

Q:

1) We have customers who buy on credit. Is it permissible for us to tell them that we will give them a discount if they pay before the due date? For example, the customer purchases goods worth R100 000 on a three month credit basis. The customer is told, “If you pay within one month, you will receive a 10% discount”. Is this permissible?

2) I owe someone money through a cash sale, and there were no terms given for payment. If I ask the seller for a discount saying, "If I pay you tomorrow, will you give me a discount? From R10 000, will you make it R9 000?" and he accepts to give me a discount, will it be permissible?

Qadha Salaah

Q:

1. I have a lot of qadha salaah and I don't know exactly how much, how should I calculate all my salaah?

2. While performing my qadha salaah, can I perform all the Fajr, then all the Zuhr, then all the Asr and so on?