I’m solving a question related to arbitrage opportunities of a currency trade. Period is 3 months. The question gives me annualized 3 month interest rates.

I thought we were supposed to use compound interest unless LIBOR is mentioned, but the answer simply divides the interest rate to four, it’s like:

Suppose that we’re given: 3 month interest rate : %16 (annualized)

Answer : interest rate for the period is %4  ( 16/4)

I’m very confused