Afinance company wants to upgrade its accounting software to a higher version. this version change requires a change in data formats. which method represents a change in data formats? a. data reusing b. data re-engineering c. data warehousing d. data mining

Ihave been given the number of guns per 100, and the total firearm-related deaths per 100,000. i have to find the actual number of guns per country and actual number of gun-related deaths. if somebody could show me how to do 1 question, i can finish the rest, i am just confused. tia