Separate per-round purchases from project-level costsSeparate per-round purchases from project-level costsRound 1$270Review decisionRelease next revisionRound 2 if planned$2702 × (15 × $12 + $60 NRE + $30 freight) + $80 once = $620A planned second round is an allowance, not a predicted failure rate.Use fresh quotes when quantity or construction changes.Engineering illustration · Illustrative inputs, not factory prices or production commitments