Hi, there will be several reasons why computer components are so expensive in your country.

High import dutys, and normal taxes plus shipping costs to your country.
Products are difficult to get,
Market price,
High profit for the reseller/dealer.
And more reasons that perhaps other forum readers can tell.

here is a site with a sample for importing goods:
https://www.kingsinternational.com.pk/blog/tejarat-blog-1/post/how-to-calculate-import-customs-duty-in-pakistan-3