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Maths question: Economics

Can someone help me with this question, I know it’s not a or b but not sure between c or d?
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Original post by alevel.student99
Can someone help me with this question, I know it’s not a or b but not sure between c or d?

Revenue is equal to tau (the curly t) times by consumption. You need to differentiate revenue with respect to tau and evaluate the resulting derivative at tau = 0.15. Have you tried this?
Original post by tomftutor
Revenue is equal to tau (the curly t) times by consumption. You need to differentiate revenue with respect to tau and evaluate the resulting derivative at tau = 0.15. Have you tried this?

Just saw this!! Thank you

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