Suppose the supply of money, measured by M1, is $3.1 trillion, output, measured by real GDP, is $20.0 trillion, and the velocity of money is 6.5. Suppose the supply of money increases to $5.0 trillion but GDP and the velocity of money do not change. What is the percent by which prices change? Provide your answer as a percentage rounded to two decimal places. Do not include any symbols, such as "$," "=," "%," or "," in your answer.