add solution in main.js

[justnicko]

No description provided.

[mateacademy-ai-mentor]

Review Summary

Your solution is approved. The implementation correctly parses population data from DOM elements, calculates both total and average values with proper rounding, and formats the output with thousands separators using toLocaleString('en-us'). All core requirements from the task are met: you correctly select span.population elements, convert comma-separated strings to numbers, update both .total-population and .average-population elements, and only modify the main.js file as specified. The code follows good practices with 'use strict' mode and modern JavaScript syntax. Great work on handling the string-to-number conversion properly by removing commas before parsing.

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