Dash mining contract calculation

with a hashpower of 100 mh/s and current hash distribution of 255o mh/s .. Current dash price of 87$ . A cloud mining contract in genesis mining is 500$ for 2 year contract at 100 mh/s… block fees being 3.6 dash .. current hash distribution is 2550 mh/s..And last 24hours total block created is 550.. Can someone help me in identifying when ll i breakeven and how much possible profit i ll make at the end of two years.. considering these factors remain the same.. thanks

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How is the mempool incorporated in the calculation of the block hash?

So I’ve been reading about how the nonce is calculated. There is one part that I don’t get. So there is a mempool, and each node (or mining node) takes a part (or the whole part) of that mempool, computes a merkle root and combines it with a nonce to get a hash that has a certain difficulty level.

Is the mempool (or part of it) is first converted to a hash by the mining software, then enters the nonce calculation?

Are there requirements on how the transactions are ordered when mining a block?

Can nodes choose the order of transactions in a block? Is a node free to choose any order of the transactions that it wants or must it be chosen chronologically?

(feel free to edit the question, I tried to explain it the best I could)

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Is there a calculation for exchange rate stability?

Exchange rate stability can be used as an indicator to determine how consistently you will earn the same profit over a period of time when mining a cryptocurrency. My current thinking is that a chart of the daily average exchange rate values from the last 14 days can indicate the exchange rate stability of a coin based on exchange rate fluctuations in the last 14 days.

But I have no idea how to actually go about calculating a metric like this or what the units would be.

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