As an explanation for my above question. All the Google play paid apps shows in my local currency. As I am in Bangladesh it shows as BDT. But we can't make any transaction in BDT through our banks. It has to be in USD.
How to Change Location in Google Play Store Sep 12, 2019 How to change your Google Play store account country Dec 09, 2016 It's now a little bit easier to change your country in the Mar 20, 2018
Apr 01, 2019 · Once you have created your account, you cannot change the country in which it is registered. This is because switching countries may cause the following problems: PlayStation Store content from other regions may not be compatible with your PlayStation system region code and would mean that you cannot download your purchases.
Which account do you have selected in the Google Play Store? Assuming you've already added the other accounts in Settings > Accounts, open the Play Store app, click the menu top left and click the drop down next to your name - you can switch accounts from there. Google play store account setup & password recovery GUIDE May 03, 2016 How to remove your old phone from Google Play | AndroidPIT
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How to change your Google Play store account country