Going off info from HOI4 Wiki
Cav = 51.6 Production
MP = 56 Production
A.Car = 240 Production
So, let's just Wolfram Alpha this
Cav
x*(51.6 / (2*1.2)) + 56 = x*(51.6 / 2) == 13.02
x*(51.6 / (2*1.3)) + 56 = x*(51.6 / 2) == 9.40
x*(51.6 / (2*1.4)) + 56 = x*(51.6 / 2) == 7.59
x*(51.6 / (2*1.5)) + 56 = x*(51.6 / 2) == 6.51
A.Cars
x*(240 / (2.5*1.2)) + 56 = x*(240 / 2.5) == 3.50
x*(240 / (2.5*1.3)) + 56 = x*(240 / 2.5) == 2.50
x*(240 / (2.5*1.4)) + 56 = x*(240 / 2.5) == 2.04
x*(240 / (2.5*1.5)) + 56 = x*(240 / 2.5) == 1.75
This shows how many units in a division you need for MP to be worth it. So at a Cav unit with 10 Cavs would not be worth having MP. This changes if you upgrade your MP (or give the Cavs guns that require more production).
Armored Cars are so insanely expensive that it is almost immediately worth using MP...
Since we should assume we should always use a full 25 unit division.
(A.Car vs Cav with best MP) vs a pony boy
(2.5*1.5*25) = 93.75 Suppression for 6056 Production and 13,000 Manpower
93.75 / 2 = 46.87 pony boys for 2418.75 Production and 46,870 Manpower
(2.0*1.5*25) = 75 Suppression for 1346 Production and 25,500 Manpower
75 / 2 = 37.5 pony boys for 1935 Production and 37,500 Manpower
Good calculation!
Helpful to get an imagination of what could or at the end should be invested.
But it is not only a question of resources.
It's a question of longterm-strategy too; which one could barly put into such a "school"-calculation.
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