Please finish it in R language

the dataframe should be called msft

1. Write a function called calculateret() to calculate the daily return. This function should have two arguments: msft(a data.frame object) and MSFT.Adjusted.

Daily return equals (closing price-opening price)/opening price

Call these returns retmsft

(This function should extract the prices for the variable indicated by MSFT.Adjusted and output the simple daily return from those prices. Please provide your function.)

2. To remove any NA's in retmsft, the code should be?

3. The mean of retmsft is? The sd of retmsft is?(solve in code)

	MSFT.Open	MSFT.High	MSFT.Low	MSFT.Close	MSFT.Volume	MSFT.Adjusted
1	12	13	11	12	10000	13
2	12	15	11	14	12000	14
3	13	16	9	15	10000	12
4	14	17	10	12	20000	11
5	12	14	11	13	3000	15