您好。计算过程如下:第一,采用概率法。NPV=(60×0.3+80×0.4+100×0.3)/(1+10%)+(80×0.3+90×0.4+100×0.3)/(1+10%)^2+(90×0.5+100×0.5)/(1+10%)^3+(80×0.5+90×0.5)/(1+10%)^4-210。第二,肯定当量法=(60×0.3+80×0.4+100×0.3)×0.9/(1+10%)+(80×0.3+90×0.4+100×0.3)×0.95/(1+10%)^2+(90×0.5+100×0.5)×0.98/(1+10%)^3+(80×0.5+90×0.5)×0.98/(1+10%)^4-210。