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PlayGround

$T o t a l R e t u r n s = (P_{e n d} - P_{s t a r t}) / P_{s t a r t} \times 100 % P_{e n d} = 为策略最终股票和现金的总价值 P_{s t a r t} = 为策略开始股票和现金的总价值$

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