In the last 2 days, the closing prices of the Ford Motor Company share listed on the New York Stock Exchange were as follows: (09/22/2021) 13,23 [usd] = P (09/23/2021) 13,71 [usd] = F

With the above data, calculate the daily variation of the stock using the simple interest formula:

F = P (1 + n*i)

n = 1 day Assume this daily variation as a daily effective rate. What is the equivalent effective monthly rate? Use year 360 days.