CVP analysis

C/S ration Shows how much each $ sold actually contributes to fixed costs. so, If c/s ration of product A = 0.4 and B= 0.25 and combined is 0.34375. how would you interpret them, because Clearly , the C/S ratio if multiplied by 100 , it shows percent of contribution as sales not percent of fixed cost as sales. to find the fixed cost per $ , It should be subtracted from 1. like Fixed cost for each unit sold of A = 0.6 per usd. am i right ? also, please do tell how do you find out the mosts profitable product from c/s ratio.