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Answer: A

Explanation: You will need to calculate the tonnage of each type of steel over the three period as follows:
Coil 30+31+32 = 93
Sheet 40+37+36 = 113
Therefore the difference is 10 thousand tons.

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Answer: D

Explanation: You will need to calculate the tonnage of each type of steel over the six month period as follows:
Coil 30+31+32+34+36+38 = 201
Sheet 40+37+36+36+34+34 = 217
Scrap 32+34+31+30+32+31 = 190
The percentage of scrap steel is given by (190/(201+217+290)) * 100 = 31.2%

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Answer: C

Explanation: The total tonnage of sheet steel was 40+37+36+36+34+34 = 217 thousand tons. Since the average value over the six month period was $256 per ton. This means that the total value of sheet steel imported was 217 * 256 = $55,552

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Answer: B

Explanation: You will need to add the figure for each of the three types of steel to get a total for each month. This gives
Jan 102
Feb 102
Mar 99
Apr 101
May 102
Jun 103
Therefore the month which showed the largest decrease over the previous month was March. Sometimes just scanning the data is enough to see the answer to a question like this one, but in this case actually calculating the answer would be the safest option.

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Answer: E 

Explanation: Scan the Total column to find the three smallest importers. Add the totals for Spain, Belgium and Italy, which gives 89+177+144 = 410. The percentage of the overall total is calculated as (410/1166) * 100 = 35.1%