There are three assets to be considered: stocks, bonds, and commodities. The current prices of these assets are listed below:

Asset	Current Price
Stocks	$500
Bonds	$1000
Commodities	$200

The following table lists the possible prices of these assets a year from today, with the corresponding probabilities.

Stocks		Bonds		Commodities
Probability	Price	Probability	Price	Probability	Price
0.25	$700	0.4	$1100	0.2	$250
0.25	$650	0.6	$1050	0.25	$240
0.25	$600			0.25	$230
0.25	$550			0.3	$220

1.)What is the standard deviation of the rate of return (in %) of stocks? Round your answer to at least 2 decimal places.

2.)What is the standard deviation of the rate of return (in %) of bonds? Round your answer to at least 2 decimal places.

3.)What is the standard deviation of the rate of return (in %) of commodities? Round your answer to at least 2 decimal places.

4.)which one is better by risk?