GRE General Test: QR-934978 GRE Quantitative Reasoning

Division R contributed how much less to the profits of Company Y in 1980 than in 1979?
In 1979 the greatest contribution to profits by one of the six divisions was what percent of the least contribution?
If the six divisions are ranked each year according to their dollar contributions to profits, from greatest contribution to lowest, how many divisions ranked lower in 1980than in 1979?
How many of the divisions contributed more dollars to profits in 1980 than in1979?