Question

5. The cost of my school exercise book was Rs. 10. Now she has to pay Rs
the same exercise book for Rs. 12. Let's calculate the percentage increses
price of the excercise book​

Answer 1

Answer:

➼ 20% price increases of the exercise book.

Step-by-step explanation:

Given that:

• The cost of my school exercise book was Rs 10.

i.e., Initial price = Rs 10

• Now she has to pay Rs the same exercise book for Rs. 12.

i.e., Final price = Rs 12

Finding the increases price of exercise book:

= Final price - Initial Price

= Rs (12 - 10)

= Rs 2

★ Formula to find the percentage increases:

Percentage increases = (100 × Increases price)/(Initial price) %

Finding the percentage increases:

→ Percentage increases = (100 × 2)/10 %

→ Percentage increases = 200/10 %

→ Percentage increases = 20 %

Answer 2

Given :-

• Cost of school exercise book was Rs. 10
• Now , she had to pay Rs. 12 for it .

To Find :-

• The increase percentage of price of that book .

Solution :-

$\underline{\bf{\dag} \:\mathfrak{As\;we\;know\: that\: :}}$

$\sf Increase \% = \dfrac{(Value\;Increased)}{Initial\; Value} \times 100 \%$

❒  ATQ :

→ Increase of Price = ( Rs. 12 - Rs. 10 )

  ⇒ Rs. 2

→ Initial Value  = Rs. 10

Let's solve by putting the values in the formula !

$\sf \leadsto \dfrac{2}{10} \times 100 \%$

$\sf \leadsto 2 \times 10 \%$

$\sf \leadsto 20 \%$

∴ The percent of increase in price of that school exercise book is 20 %