Directions for the following 3 (three) items:

The following three items are based on the graph given below which shows imports of three different types of steel over a period of six months of a year. Study the graph and answer the three items that follow.

The figures in the brackets indicate the average cost per ton over six months period.

By how much (measured in thousands of tons) did the import of sheet steel exceed the import of coil steel in the first three months of the year?