Answer:
12% short run, 21% long run
Explanation:
In the short run, the price elasticity for biscuits is 0.8
0.8×15
= 12%
In the long, run the price elasticity for biscuits is
= 1.4×15
= 21%
Hence the quantity of supplied dog biscuits will increase by 12% in the short run and 21% in the long run