Question

the price of petrol increased from rupees 75 per litre to rupees 81 per litre find the percentage increase in the price of petrol​

Answer 1

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Given:

Original price = Rs 75 per litre

New price = Rs 81 per litre

To find:

Percentage increase in price of petrol = ?

Solution:

First we have to find the difference between new price and original price of petrol

$= 81 - 75 \\ =6 \\ \\ = rs \: 6$

Increased rate in value of petrol is Rs 6

To find percentage increase formula is:

$\\ \dfrac{difference}{original \: price \: given} \times 100$

So, while calculating

$\\ = \dfrac{6}{75} \times 100 \\ = 8 \\ \\ 8\% \: percentage \: increase \: in \: price \: of \: petrol$

Therefore, percentage increase in price of petrol is 8%

$\boxed{Extra \: knowledge}$

1. While solving such questions if it is not mentioned that it is percentage increase or decrease, then we can find it by calculating.
2. While calculating percentage increase If the answer we get is negative then it means it is percentage decrease
3. We can calculate manually in mind if it is percentage increase or decrease by seeing the number given
4. For example: If initially price is 5 then it became 8 we can see that there is percentage increase
5. In this way we can solve such problems. Learn formula given above and Try solving more such problems to get a good hold

Answer 2

Step-by-step explanation:

Given

Price of Petrol =₹ 75

After increment

Price of petrol = ₹ 81

So increased price = 81 -75

= ₹ 6

$increase </strong><strong> \: </strong><strong> \: </strong><strong>percent</strong><strong>= \frac{increase \: in \: price}{initial \: \: price \: } \times 100 \\ \\ = \frac{6}{75} \times 100 \\ \\ = \frac{6 \times 4}{3} \\ \\ = 8\%$

So increase percentage is 8% ...... ......