Recycled feedstock energy

A molded thermoplastic part requires $1.8\,\mathrm{kg}$ of saleable product. Feedstock contains $35\%$ recycled polymer by mass; virgin and recycled feedstock require $72$ and $18\,\mathrm{MJ/kg}$ of feedstock, respectively. Process mass yield is $90\%$ and rejected material is not recovered in this calculation. Find the total feedstock energy per saleable part and the percentage saving relative to all-virgin feedstock at the same yield.