Question

The cost of an article goes down every year by 20% of its previous value find it's original cost of the cost of it after 2 years is 19200 rupees

Answer 1

Answer:

let the price of an article before 2years be x

AtQ

The cost of an article goes down every year by 20%

after first year cost will be x-(20% of x)

=x-(20/100*x)

=x-2x/5

=3x/5

after second year cost will be 3x/5-(20%of 3x/5)

=3x/5-(20/100*3x/5) =192500

=3x/5 -3x/25.=192500

=72x/5 =192500

72x = 192500*5

x=962500/72= 13368.05