The population of a town increases by 8% annually. If the present population is 54000, what was it a year ago?
Let population of the town a year ago = Z
∴ Present population = 108% of Z
⇒ 54000 = Z × 108/100
⇒ 54000 = Z × 27/25
⇒ Z = 54000 × 25/27
⇒ Z = 2000 × 25
⇒ Z = 50000