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The ratio of price elasticity of supply of a commodity A and B is 1:1.5. 20% fall in price of A results in a 40% fall in its supply. Calculate the % increase in supply of B if its price rises from Rs.10 to Rs.11.?
Most Upvoted Answer
The ratio of price elasticity of supply of a commodity A and B is 1:1....
Solution:

Given:

Price elasticity of supply of A and B = 1:1.5

Percentage fall in price of A = 20%

Resultant fall in supply of A = 40%

Initial price of B = Rs.10

Final price of B = Rs.11

To find:

The percentage increase in supply of B

Calculations:

Let's assume that the initial supply of A is 100 units.

As per the given information, a 20% fall in the price of A leads to a 40% fall in its supply.

Therefore, the new price of A = 0.8 * initial price of A = 0.8 * P

And the new supply of A = 0.6 * initial supply of A = 0.6 * 100 = 60 units

Now, we know that the ratio of price elasticity of supply of A and B is 1:1.5

Let's assume that the price elasticity of supply of A is x and the price elasticity of supply of B is 1.5x.

Hence, we can write:

Elasticity of supply of A / Elasticity of supply of B = 1/1.5

x / 1.5x = 1/1.5

x = 2.25x/3

x = 0.75x

Therefore, the price elasticity of supply of A is 0.75 and the price elasticity of supply of B is 1.5 * 0.75 = 1.125

Now, we can use the formula of price elasticity of supply to find the percentage increase in supply of B:

% change in quantity supplied of B = Price elasticity of supply of B * % change in price

where % change in price = (final price - initial price) / initial price * 100

= (11-10) / 10 * 100 = 10%

% change in quantity supplied of B = 1.125 * 10

= 11.25%

Therefore, the percentage increase in supply of B is 11.25%.

Conclusion:

The percentage increase in supply of B if its price rises from Rs.10 to Rs.11 is 11.25%.
Community Answer
The ratio of price elasticity of supply of a commodity A and B is 1:1....
For A,
Fall in price = 20%
Fall in supply = 40%
Change in supply is twice the change in price.
Elasticity of A = 2
The ratio is given as 1:1.5
multiply the ratio by 2 so that elasticity of A matches with first place of ratio.
New ratio after multiplied by 2= 2:3
therefore elasticity of B=3
For b ,
change in price = 11-10=1
% change in price = 10%
therefore
% change in quantity supplied= elasticity × %change in price = 3×10 = 30%
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