Assess the true annual cost of a SaaS subscription

I'm evaluating adopting (tool name); the public plans are: (paste pricing info, including plan names, per-user monthly price, whether AI or add-on modules cost extra, and whether there are quotas and overage charges). Our team is (headcount), of whom (headcount) will truly use it daily. Please: 1) calculate the actual total first-year spend, including AI add-ons, overage fees, and likely training time costs; 2) list three commonly overlooked hidden costs; 3) propose five questions to always ask the vendor before purchase (including data residency, how departing-employee seats are counted, and the price-increase notice period); 4) give me an exit-cost assessment for "if we want to switch away after a year." In Traditional Chinese with Taiwan usage, showing amounts in both USD and an approximate NT$ figure.