Answer:
The company should increase its average in-stock items by 43
Explanation:
PIIS of competitior = In stock unit / Total SKU = 653 / 687 = 95%
Current PIIS of company is 87% on 531 SKUs
So,
in stock SKUs = PIIS * Total SKUs = 87% * 531 = 461.97
If it increases average in stock items by 43, in stock units will increase to 461.97 + 43 = 505
The new PIIS will be In stock unit/Total units = 505 / 531 = 95%, which will be same as competitor