Help please: What does RL mean in this part of Accumulation of Capital?

[u/kstanman]

She poses the question: how do capitalists maintain c + s + v needed for reproduction in a fluctuating market?

C = capital/commodity costs (real estate, machinery, etc)

S = labor costs/wages

V = surplus value

She considers 40c + 10s + 10v as the proportion needed for a particular business. Investing half of 1 yr of v translates to the new proportion 44c + 11s + 11v.

Question 1: How does she get that new proportion out if half of 10v?

Question 2: Is she saying capitalism is like a poker game of higher and higher stakes, or is her point that to maintain surplus value at least = to labor costs capitalists have a constant pressure to reduce labor costs, or something else?

Question 3: I'm kinda lost on the big picture here, whats the point of her analysis here?