Think about this....
One MPA at One Spa is infected, in one day she infects 10 customers and the other 2 MPAs - Total 13
the next day the 3 MPAs go work at different spas
they each infect 10 customers and 2 MPAs - Total infected 30 customers and 9 MPAs plus the 10 customers from day 1 = 49
the next day the 9 MPAs go work at different spas
they each infect 10 customers and 2 MPAs each Total infected 90 Customers and 27 MPAs plus the 40 customers from the previous 2 days = 157
The next day the 27 MPAs each infect 10 customers = 270 customers plus the 130 customers from the days before plus 27 MPAs = 427 infected
now the 427 start infecting random other - we are all fucked
One MPA at One Spa is infected, in one day she infects 10 customers and the other 2 MPAs - Total 13
the next day the 3 MPAs go work at different spas
they each infect 10 customers and 2 MPAs - Total infected 30 customers and 9 MPAs plus the 10 customers from day 1 = 49
the next day the 9 MPAs go work at different spas
they each infect 10 customers and 2 MPAs each Total infected 90 Customers and 27 MPAs plus the 40 customers from the previous 2 days = 157
The next day the 27 MPAs each infect 10 customers = 270 customers plus the 130 customers from the days before plus 27 MPAs = 427 infected
now the 427 start infecting random other - we are all fucked