(c)

(i) Identification and explanation of the iso-contribution line 2
Identification and explanation of the feasible region 2
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4
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(ii) Explaining how to use line for identification of optimum point 1·5
Identification of optimum point 0·5
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2
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(iii) Explaining what slack values are 1
Identifying Betta as slack 1
Identifying Singa as slack 1
Identifying slack demand for cookies 1
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4
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