Question

8. The price of an article is reduced by 20%. What
is the ratio of:
(i) new price to old price.
(ii) change in price to old price.
tell me it's right answer with explain​

Answer 1

Hi!

I’ll start by saying no the answer is not 10% decreased.

I’ll explain the answer by taking an example. It’s VERY SIMPLE.

So whenever you see percentage change type of questions, always solve the question by taking value 100.

Now, say, the price of an article is Rs 100.

Price increases by 20%, i.e ut increases by Rs 20.(20% of Rs 100), the final price is Rs 120. (As final price= Initial price + Price change)

Question says, the price then decreased by 30%, now the catch here is, we’ll find 30% of Rs 120. As thats the last price calculated. 30% of Rs 120 is Rs 36. As it’s price decrease, the final price will be, 120–36, i.e. Rs 84.

We can easily see, the total decrease is Rs 16 from the initial price. (Rs 100- Rs 84).

Hence the overall percentage change will be 16%.

See, how easy it is to solve such questions. Taking value as 100 makes the calculation easier, and qs can be solved within seconds.

Thanks!

Answer 2

Answer:

Step-by-step explanation:

(i) 4:5, take 100 as example . new price = 80, old price 100, ratio is 4:5

(ii)1:5 , same example . discount 20 , old price=100, ratio 1:5

Hope it helps :-)