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enter image description here I should be grateful for a breakdown of the steps I should take into account. The answer is (D).

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Client $i$ will purchase so long as their consumer surplus is positive, i.e. so long as $$CS_i=WTP_i-75000\geq 0.$$

Once you have determined which clients $i$ satisfy this condition, you can just calculate $CS_i$ for each such client and add them up.

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