Question

the petrol price after two successive price hike of 20% and 30% is Rs 78 per litre what is the price of petrol before these hikes?
Plz give the step by step solution

Answer 1

Answer:

Step-by-step explanation:

Suppose the initial price of petrol was 100

After 20% hike , its price reached 120 rs

After 30 % hike , its price reached - 120 + 30%of120 = 156rs

So the % change in the price of petrol is 56 %

Now,

Let the cost price of petrol is x rs

After 56% increase it becomes 78 rs

i.e

x + 56%of x = 78

1.56x = 78

X = 78/1.56

X =50 rs

So the initial price was 50rs