Website cost depends less on the number of menu items and more on the decisions behind them: how many unique page types are needed, whether content is ready, how custom the design must be, and what integrations are required.
A focused landing page is usually faster to plan and build than a full business website with service pages, case studies, forms, tracking and SEO foundations. A custom web application is a different scope again because it includes data, users, roles and business logic.
The best way to compare quotes is to ask what is included: discovery, copy structure, responsive design, development, forms, analytics, deployment, revisions, post-launch fixes and ownership handover. A cheaper quote that omits these items can become expensive later.
Before requesting a price, prepare your business goal, required pages, example sites, content status, must-have integrations and desired launch date. That gives the development team enough information to estimate responsibly.