Calculation of Elasticity of Supply:
Elasticity of supply is calculated using the formula:
Elasticity of Supply = (% Change in Quantity Supplied) / (% Change in Price)

Given Data:
Initial Price (P1) = ` 15
Final Price (P2) = ` 12
Initial Quantity Supplied (Q1) = 6 units
Final Quantity Supplied (Q2) = 5 units

Calculating % Change in Price:
% Change in Price = ((P2 - P1) / P1) x 100
% Change in Price = ((12 - 15) / 15) x 100
% Change in Price = (-3 / 15) x 100
% Change in Price = -20%

Calculating % Change in Quantity Supplied:
% Change in Quantity Supplied = ((Q2 - Q1) / Q1) x 100
% Change in Quantity Supplied = ((5 - 6) / 6) x 100
% Change in Quantity Supplied = (-1 / 6) x 100
% Change in Quantity Supplied = -16.67%

Calculating Elasticity of Supply:
Elasticity of Supply = (% Change in Quantity Supplied) / (% Change in Price)
Elasticity of Supply = (-16.67%) / (-20%)
Elasticity of Supply = 0.8333

Interpretation:
The elasticity of supply in this scenario is 0.8333, which indicates that the supply is relatively inelastic. This means that the quantity supplied is not very responsive to changes in price. A value less than 1 suggests that suppliers are not very sensitive to price changes, and the supply does not adjust significantly when prices fluctuate.

Change in qd/change in price=price/quantity
1/3*75/6=0.83