Dominic sent a chain letter to his friends, asking them to forward the letter to more friends. The relationship between the elapsed time ttt, in hours, since Dominic sent the letter, and the number of people, P_{\text{hour}}(t)P hour ​ (t)P, start subscript, start text, h, o, u, r, end text, end subscript, left parenthesis, t, right parenthesis, who receive the email is modeled by the following function: Phour(t)=18⋅(1.05)t Complete the following sentence about the daily rate of change in the number of people who receive the email. Round your answer to two decimal places. Every day, the number of people who receive the email grows by a factor of .