If population of certain city increases at the rate of 5%. If population in 1981 was 277830, then population in 1978 was? Choose the correct option.
A) 120000  B) 228788  C) 266891  D) 240000  E) 127791
X * (105/100) * (105/100) * (105/100) = 277830   X = 277830/1.157625= 
<gadget id="calculator">277830/1.157625</gadget>
<output>240_000</output>
240000   Answer:240000
<result>D</result>
If population of certain city increases at the rate of 5%. If population in 1981 was 277830, then population in 1978 was?