A game of chance offers the following odds and payoffs. Each play of the game costs $100, so the net profit per play is the payoff less $100.

Probability	Payoff	Net Profit
0.10	$700	$600
0.50	100	0
0.40	0	100

a-1. What is the expected cash payoff?

Note: Round your answer to the nearest whole dollar amount.

a-2. What is the expected rate of return?

Note: Enter your answer as a percent rounded to the nearest whole number.

b-1.What is the variance of the expected returns?

Note: In the calculation, use the percentage values, not the decimal values for the rates of return. Do not round intermediate calculations. Round your answer to the nearest whole number.

b-2.hat is the standard deviation of the expected returns?

Note: Enter your answer as a percent rounded to 2 decimal places.