optimisation : The paper processing plant in Newmarket uses technology 1 with conversion rate of processing of 70%; 1 tonne of wastepaper produces 0.7 tonne of new paper. However, the processing plant in Downham Market can use either technology 1 with conversion rate of 70% or technology 2 with conversion rate of 75%: not both technologies can be used at the same time. The cost of paper processing is 90 per tonne of wastepaper for technology 1 and 95 for technology 2. Processed new paper is sold at a price of 1125 per tonne. The maximum capacities of the processing plant in Newmarket is 8000 tonnes of wastepaper, whereas capacities of the plant in Downham Market are 6500 tonnes if technology 1 is used and 5500 tonnes if technology 2 is used