Answer:
2%
Explanation:
Data provided in the question
Interest rate on a checking account = 1%
Interest rate on treasury bill = 3%
So, the opportunity cost of holding cash in a checking account is
= Interest rate on treasury bill - Interest rate on a checking account
= 3% - 1%
= 2%
Simply we deduct the checking account interest rate from the treasury bill interest rate so that the opportunity cost could come