X/(1+0.5)*4+20/60=X/4 =X/1.5*4+20/60=X/4 =32X/12-3X/12=-1/3 =29X/12=-1/3 =29X=-4 =X=-4/29
(1+50%)^4=(3/2)^4 =81/16把上式带入方程得 x=108/17