Question

the cost of a car goes down every year by 15% of its preious value find the original cost, if the cost of it after 2 years is Rs. 2,16,750/-

Answer 1

if the original cost is X
then next year it cost 15% less
Y = X - 0.15X = 0.85X
here Y is cost after one year
now next year it cost 15% less
so Y - 0.15Y = 0.85Y
but we know after two years cost price is 2,16,750
so
0.85 Y = 2,16,750
But Y = 0.85 X
0.85*0.85*X = 2,16,750
X = 3,00,000
so original cost is Rs 3,00,000/-