Answer:
$21,000,000
Explanation:
Ratio is used in allocating the research and development cost
This is the expression of relationship between two or more data showing the number of times one data contains or is contained in another data
Total research and development cost = $60,000,000
Revenue
Kentucky = $56,000,000
Arizona -= $ 100,000,000
Illinois = $84,000,000
Total = $240,000,000
Illinois allocation of research and development cost=
84,000,000/240,000,000*60,000,000 =$21,000,000