Under the Pereira approach, when the appreciation of a business is primarily due to community labor, how is the SP portion determined?

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In the Pereira approach, when the appreciation of a business comes mainly from community labor, the portion attributed to SP (the separate property) is calculated as the original value of the business plus a fair return on that initial investment. The remaining increase in value goes to CP (community property). This means SP is not the current value of the business, but the initial capital plus a reasonable earnings on that capital (commonly around 10%). For example, if the business started with an initial SP value of 100, then SP would be 110 after applying a 10% return, and CP would be the rest of the increase in value. This aligns with the idea that SP should recover the original investment plus a fair return, while the additional growth due to community labor goes to CP. The other options violate this principle by treating SP as the current value, or as a simple half-split, or by using a fixed percentage unrelated to the initial investment.