Okay, let’s calculate Brenda’s rate. She has skills in interior design, space planning, renovation, and sales. These are in-demand skills, especially in Miami, Florida. However, I couldn’t find specific salary benchmarks for interior designers in this location. Typically, interior designers charge between $40–$75 per hour, depending on experience and skills. Given Brenda’s skills and location, I estimate her hourly rate to be around $75, which is at the lower end of the range. This is a conservative estimate, considering she might charge more with experience and a stronger portfolio.