Technical Question: Depreciation/Half-Year Convention

Going over some of the WSO PE prep material, and one of the prompts says a project will take 2 years to complete. Approximately 75% of the project is being complete in year 1, and the remaining 25% will be completed in year 2. Useful life of the project is 10 years.

The CapEx for the project in year 1 is $75, while CapEx in year 2 is $25.

The Depreciation for the CapEx spent in year 1 is calculated as follows:

Year 1 Capex / 2 / Useful Life
or
$75/2/10

Why do they divide the initial capex by 2? Is it because of the Half-Year Convention?

The remaining depreciation is simply Capex/Useful life:

Example:
Depreciation of CapEx from year 1 = $75/10 years

Many thanks!

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