Question

a 20 reduction in the price of oil makes a person buy 15 liter more oil for 4500 what is the initial price per litre of oil

Answer 1

Answer:

A reduction of 20% in the price of sugar enables a housewife to purchase 6 kg more for Rs. 240. What is original price per kg of sugar.

A. Rs. 10 per Kg

B. Rs. 8 per Kg

C. Rs. 6 per Kg

D. Rs. 5 per Kg

Answer: Option A

Solution(By Examveda Team)

It is based on inverse proportion or product constancy concept. Reduction in price 20% amount of sugar will increase 25%

It means,

25% = 6 Kg. So,

Initially, total Sugar = 6 × 4 = 24Kg. Thus,

Original price of the sugar was,

24024

= Rs. 10 per kg.

Note:

Let initial price of 100 kg Sugar was Rs. 100.

Now, 20% decrease in rate then rate of 100 kg sugar would be Rs. 80.

So,

Rs. 80 = 100 kg sugar.

Rs. 1 = 10080

kg sugar.

Rs. 100 = 100×10080

= 125 Kg sugar.

Increment in sugar = 25 kg.

% increment = 25×100100

= 25%.

Means 20% rate decrease, 25% of consumption increase.