In 1995 Division A of Company X had 4 850 customers. if there were 86 service errors in Division A that year, what was the service-error rate, in number of service errors per 100 customers, for Division B of company X in 1995 ?

(1) In 1995, the overall service-error rate for Divisions A and B combined was 1.5 service errors per 100 customers

(2) In 1995 Division B had 9350 customers, none of whom were customers of Division A


From Statement (1)

(86 + x ) / (4850 + B) = 1.5 / 100

Where x = errors in Division B, B = customers in B.

Not Sufficient.

Is the above equation right?


From Statement (2)

We get B. Not Sufficient.


(1) + (2)

x is the only unknown. We can find x and later service errors per 100 customers.