To compensate the miner who could solve the PoW as the first one, they will receive some coins as a reward for keeping them motivated due to the costs related to mining process (electricity and hardware).
Does this reward include both following parts?
- Newly minted coins.
- Transactions fees included in winner's block.
If yes, the second part seems logical and the coins can be provided simply through the account of the participants who submitted the transactions.
However, concerning the first part i.e. "newly minted coins",
(a) What is the reason to add this complementary reward?
(b) How are those new coins minted? And how to calculate the amount of those new coins?