The beta for Walmart's stock is 0.39, the current risk-free rate is 1.8% and the current expected return on the market portfolio is 7.4%. If the expected return on the market portfolio increases by 0.78%, by how much will the expected return on Walmart's stock change? Express your result in percent and round to two decimals (do not include the %-symbol in your answer). Enter increases as positive numbers, decreases as negative numbers.