These probabilities are given as percentages pij, where i (with 1 ≤ i ≤ m) is the number of the project and j is the number of people working on it. 
一直以为是Pij是第i个工程第jth人的概率... 原来 j 是number！这题读了良久!  =,=
(0.9*(2000-200*1) - 0.1*0)*100;