Okay, let’s tackle this. So Hassan Amini has 43 years of experience as a Mechanical Engineer, which is extremely long. Typically, Mechanical Engineers with this level of experience can charge higher rates. However, location is Iran, which might have different salary benchmarks compared to Western countries. Considering his experience and education, I'll estimate his hourly rate to be on the lower side due to the location. A more accurate estimate would require knowledge of the Iranian job market. Based on general knowledge, Mechanical Engineers with similar experience in the US or Europe might charge $100-$200 per hour. Given the significant difference in cost of living and industry standards, I'll estimate Hassan’s hourly rate to be around $75.