A currency dealer has good credit and can borrow either $1,000,000 or 800,000 for one year. The one-year interest rate in the U.S. is i$ = 2% and in the euro zone the one-year interest rate is i = 6%. The spot exchange rate is $1.25 = 1.00 and the one-year forward exchange rate is $1.20 = 1.00. Show how to realize a certain profit via covered interest arbitrage.

A) Borrow 800,000 at i = 6%; translate to dollars at the spot, invest in the U.S. at i$ = 2% for one year; translate 850,000 back into euro at the forward rate of $1.20 = 1.00. Net profit 2,000.

B) Borrow $1,000,000 at 2%. Trade $1,000,000 for 800,000; invest at i = 6%; translate proceeds back at forward rate of $1.20 = 1.00, gross proceeds = $1,017,600.

C) Borrow 800,000 at i = 6%; translate to dollars at the spot, invest in the U.S. at i$ = 2% for one year; translate 848,000 back into euro at the forward rate of $1.20 = 1.00. Net profit $2,400.

D) Borrow 800,000 at i = 6%; translate to dollars at the spot, invest in the U.S. at i$ = 2% for one year; translate 848,000 back into euro at the forward rate of $1.20 = 1.00. Net profit is $2,400. Additionally, one may borrow 800,000 at i = 6%; translate to dollars at the spot, invest in the U.S. at i$ = 2% for one year; translate 850,000 back into euro at the forward rate of $1.20 = 1.00. Net profit is 2,000.

I'm confused about borrow from which country and sell in which country, and how could i know that( i know it should borrow from lower and sell in higher ,but i don't know which one is lower or higher and why is that country or i mean compare which data)

Thank you so much!