A company owns mines, A produces 1 tonne of high grade ore 3 tones of medium grade ore and 5 tones of low grade ore each day , and mine B produces 2 tones of each of te three grades of ore each day the company needs f80 tones of high grade ore 160 tones of medium grade ore and 200 tones of low grade ore if it cost Rs 200 per day to work each mine using corner point method find the number of edays each mine has to be operated find the number of days each mine has to be operated for producing the required output with minimum total cost