with solution pls. i need the solution for #19

a. Zebra Manufacturing Company incurred a joint cost of P600,000 in the production of R and S in a joint process. Presently, 1,800 of R and 1,400 of S are being produced cach month Management plans to docrease R's production by 300 units to yield added production of 500 S. Further the method of processing calls for minor modifications which will add P20,000 to the joint cost. This cost is allocable to S.. 18. The costs allocable to R and S before changes to existing reduction, if joint costs are allocated according to the proportion of Sand R produced, are: R =P 262,500; S =P 337,500 b. R =P 264,706; s = P 335,294 R =P 273,529: S=P 326,471 d R =P 337,500; S =P 262.500 19. Compute the unit cost of S, using the replacement method a. P178.29 b. P182.35 c. P187.50 d. P198.61 C