Answer:
2000 customers paid the old rate and 500 customers paid the new rate.
Step-by-step explanation:
The new renewal rate is twice the old rate. That is
dollars
Let x be the old rate.
Let y be the new rate.
As given: Your income from renewals was $750,000 this year.
So, we have the following equation:
or
.....(1)
And total you have 2500 customers, so we get the following equation:
.....(2)
Deriving
from (2) and substituting in (1)

=>
y = 500

x = 2000
Hence, 2000 customers paid the old rate and 500 customers paid the new rate.