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5.0 The ABC Company produces concrete. Two ingredients in concrete are sand (costs Php 300 per ton) and gravel (costs Php 400 per ton). Sand and gravel together must make up exactly T75% of the weight of the concrete. Also, no more than 40% of the concrete can be sand and at least 30% of the concrete be gravel, Each day 2000 tons of concrete are produced. To minimize costs, how many tons of gravel and sand should be purchased each day