Use the table in the following problem. Profits as Percentage of Sales Type Firm196619701974 Petroleum11.29.312.7 Drugs10.89.412.2 Chemicals8.05.08.2 Motor Vehicles6.22.42.7 Electrical4.83.33.9 Food2.72.52.8 Which industry had the greatest percentage increase in profits as a percentage of sales between 1966 and 1974? petroleum What was the percentage increase (to the nearest tenth)?