ROI 630% in the area of Beauty? It is easy!

Progress the course of hardware pedicure.
Customer: Beauty Salon
Advanced service: course of hardware pedicure.
Duration of the advertising campaign: 1 month.
The purpose of the advertising: Generation of lead.
Budget is $540.
In the month there were 303 leads.
The cost of 1 lida is $1.78.
Number of arrived customers: 56.
The cost of the course: $90.
Total Profit: $5040
Budget + advertising services = $540 + $150 = $690.
ROI = (5040-690)/690 * 100% = 630%.