How to use mathematica to solve this problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg128128] How to use mathematica to solve this problem*From*: åçå <toc531 at gmail.com>*Date*: Tue, 18 Sep 2012 03:38:58 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-newout@smc.vnet.net*Delivered-to*: mathgroup-newsend@smc.vnet.net

Situation: Each unit purchased costs "v",each unit sold produces a revenue of "p",each unit disposed as salvage gives a revenue of "g"=EF=BC=8Cand there is an additional cost "B" associated with each unit of demand not satisfied. If a quantity "Q" is stocked and a demand "x" occurs, the profit is P(Q,x)= -Qv+px+g(Q-x) if x<=Q -Qv+pQ-B(x-Q) if x>=Q The expect value of the profit,as a function of Q is given by E[P(Q)]=Integral[P(Q,x),(x,0,infinite)] Question: HOW to use mathematica to present"E[P(Q)]"