Question

a car cost rupees 60,000when it is new. After one year it's value goes down to rupees 40,000. by how much per cent has its decreased?

Answer 1

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per cent decrease is absolute decrease divided by original amount
the decrease was 20000 Rs.
the original amount was 60000 Rs.
That fraction is 1/3
The per cent decrease is 33 1/3%. 
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Answer 2

cost price of car = ₹60,000

after 1 year, value of car = ₹40,000

decrease in value = ₹60000 - ₹40000 = ₹20,000

$percentage \: decrease = \frac{decrease}{cost \: price} \times 100 \\ \\ = \frac{20000}{60000} \times 100 \\ \\ = \frac{1}{3} \times 100 \\ \\ = 33.33 \: percent$


Percentage decrease in value is 33.33%