I don’t know how many delegates are up for grabs, but as far as I know, the Michigan primary is “winner take all.”
I think it goes by congressional district plus some delegates at large. Pretty sure it's not winner-take-all.
If I remember correctly, the RNC was going to strip half their delegates. No telling if they’ll follow through, though.
15 district delegates are to be allocated to presidential contenders based on the primary results in each of the state’s 15 congressional districts: each congressional district is assigned 1 (?) (pre-penalty 3) National Convention delegates and the presidential contender receiving the greatest number of votes in that district will receive all of that district’s National Convention delegates.
15 (pre-penalty 15 = 10 at-large, 2 bonus, plus 3 party leader National Convention Delegates are to be proportionally allocated to presidential contenders based on the statewide vote. The party leaders include the National Committeeman, the National Committeewoman, and the chairman of the Michigan’s Republican Party. These delegates will attend the convention as pledged delegates by virtue of their position.
A candidate must receive 15% of the statewide vote to be eligible to receive National Convention delegates. From those candidates meeting this threshold, proportionally allocate 15 (?) (pre-penalty 12) national convention delegates according to the statewide vote. Round factions to the nearest whole number (below 0.5 are rounded down, 0.5 and above are rounded up). If the end result is less than 15 (?) (pre-penalty 12) delegates, allocate 1 additional delegate to the candidate receiving the most votes statewide. If the end result is more than 15 (?) (pre-penalty 12) delegates, subtract 1 delegate from the candidate receiving the fewest votes statewide.