Question

the income of a company increases 20% per annum. if its income is 2664000 Rs. in the year 1999 what was its incom in the year 1997?

Answer 1

1850000............1.2*1.2*x=2664000---------------then x=1850000

Answer 2

In 1999 its income = Rs 2664000
In 1998 its income will be 2664000 - (20/100)×2664000
= 2664000 - (1/5)×2664000
= 2664000 - 2664000/5
= 2664000 - 532800
= Rs2131200
In 1997 its income will be = 2131200 - (20/100)×2131200
⇒2131200 - (1/5)×2131200
⇒2131200 - 2131200/5
⇒2131200 - 426240
⇒1704960
∴The income of the company in 1997 is Rs1704960