Giving kaffaarah for missed salaahs

Q: I would like to know if there is a way I could pay for the missed salahs in my case.

After giving birth my menses cycle did not go normal and was bleeding continuously due to feeding. An Aalimah told me I needed to refer back to my habit previous of pregnancy which was 23 days of tuhr and 5 days of haidh. In this way while doing the calculations almost 2 years later I have discovered I have missed about 400 salah.

With 2 children it may become difficult to perform qadha. Is there a way I could pay for this miscalculation or does Qadha have to be performed?

Speaking lies

Q: What should I do when I have cheated in Quran hifz and I have only learned 20 parahs. Now my teacher wants to take tests from me. If I tell the truth it would mean great disrespect to my family. I am very depressed.

Selling animals for fighting

Q: For animals used in fighting such as roosters and dogs, their price depends on their fighting ability. If a rooster/dog is an excellent fighter, it would be expensive. So is it halaal to include the price of an animal's fighting ability in the overall price of the animal? Would the amount added to the price based on the fighting ability be halaal?