CPI=1100/1300 = 0.846
SPI=1100/1000 = 1.1
In the problem statement, it is given that the customer is concerned about the schedule. It is also given that the same rate of productivity will continue in future also.
So many people may be tempted to use the formula EAC=AC + (BAC-EV) / (CPI*SPI). However the SPI is more than 1 and project is ahead of schedule. So the correct formula will be EAC=AC+ (BAC-EV)/CPI giving the result 2364.