The population of a town is 7800. It decreases annually at the rate of 10% p.a. What was its population 2 years ago?	Choose one:
A) 9600
B) 8000
C) 8500
D) 9500
E) 10000
Formula :   ( 9600fter =100 denominator   9600go = 100 numerator)   7800 Ã— 100/90 Ã— 100/90 = 9629   9600)
<result>A</result>
The population of a town is 7800. It decreases annually at the rate of 10% p.a. What was its population 2 years ago?