Selling in mutiple languages with currency changer in store and checkout

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Hey there!


I am currently facing this problem of me wanting to brand my store in 2 other countries. 


1) I know how to switch languages with 3rd party app "langify", but I need the currencies to be switched as well when people from specific countries enter my website.

2) The price is for example 79 $, but when converted to euros, its 66,53 which looks unprofessional imo - I would like to round it up to 69 

3) Can I change the checkout language so it matches where the customer is from?