Question

The cost of a pen was increased from Rs 18 to Rs 20.70. What is the per
crease in the cost of the pen ?
Scanne​

Answer 1

Answer:

go home

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Let the original price of one-litre petrol be Rs.x

In Rs.1320 we obtain

x

1320

litres of petrol at this rate

If the price is increased by Rs.5, then the new price of petrol is Rs. (x+5) per litre.

Then,

In Rs.1320 we obtain

x+5

1320

litres of petrol at the new price

According to the given condition, one gets 2 litres less petrol on spending Rs.1320

Petrol obtained at old price − petrol obtained at new price =2

∴

x

1320

−

x+5

1320

=2

∴ 1320(x+5)−1320x=2x(x+5)

∴ 1320x+6600−1320x=2x

2

+10x

∴ 2x

2

+10x−6600=0

∴ x

2

+5x−3300=0

∴ x

2

+60x−55x−3300=0

∴ (x+60)(x−55)=0

∴ x=−60 or x=55

But x=−60 is not possible (price of petrol cannot be negative), so x=55

The old price of petrol is Rs.55/litre and the increased price is Rs.60/litre