Given Sidney's extensive experience as a self-employed accounting professional, his skills in accounting, auditing, and financial analysis, and his location in Evanston, Illinois, I estimate his hourly rate to be around $150. This rate is comparable to other experienced accountants in the industry, considering his 74 years of experience and the fact that he is self-employed. However, without specific industry benchmarks or average rates for self-employed accountants in this location, this estimate is somewhat speculative.