If population of certain city increases at the rate of 5%. If population in 1981 was 138915, then population in 1978 was?
Choose the correct answer:
A) 120000  B) 27778  C) 27779  D) 27767  E) 29087
X * (105/100) * (105/100) * (105/100) = 138915   X = 138915/1.157625= 
<gadget id="calculator">138915/1.157625</gadget>
<output>120_000</output>
120000   120000nswer: 120000
<result>A</result>
If population of certain city increases at the rate of 5%. If population in 1981 was 138915, then population in 1978 was?