Build a decision table for a coupon and shipping policy.

Instruction: Enumerate all Boolean combinations and give the expected discount and shipping charge for each.

Context:

A fictional checkout has three independent Boolean inputs: member M; eligible coupon supplied C; and pre-discount subtotal at least $50, T. The discount is 10% of the subtotal only when both M and C are true; otherwise it is zero. Shipping is free when M or T is true; otherwise shipping costs $5. The threshold uses the pre-discount subtotal. Ignore tax and rounding; all coupons described here are otherwise valid.

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I would separate the two decisions: discount requires both membership and a coupon, while free shipping requires membership or meeting the pre-discount threshold. Three Boolean inputs give eight combinations, and all are feasible under this brief...

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