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Your Angel Investor total directly correlates to the all-time cash earned figure. Earning Angels slower than you'd like? Try applying more bonuses, boosts, upgrades (Angel upgrades, too!) and multipliers. Remember, boosting your profits will also boost your Angels.
For the math geeks out there, the formula for earning Angel Investors is [150 * the square root of (Lifetime Career Earnings in quadrillions)] – Angel Investors spent. This means that when you earn an Angel investor, it takes more money for you to earn your next one.