Will you please help me to understand the following questions?

Questions 46-50.

DIRECTIONS: Answer Questions 46 through 50 on the basis of the information below.

Department XYZ

Size Distribution of Purchasing Orders

Amount of Order (dollars) Number of Orders

1 - 9.99 91

10 19.99 135

20 49.99 320

50 99.99 712

100 199.99 1050

200 499.99 735

500 999.99 305

1000 1999.99 94

2000 4999.99 36

5000 9999.99 18

10000 19999.99 3

20000 49000.99 1

Question 46. The mode of this distribution of purchase orders is APPROXIMATELY

A. $100 B. $150 C. $200 D. $1050

Question 47. The median value is APPROXIMATELY

A. $100 B. $150 C. $200 D. $1050

Question 48. The value which falls at the tenth percentile is MOST NEARLY

A. $21 B. $39 C. $45 D. $107

Question 49. Suppose ten orders are added to each class interval below $1,000, but only one order is added in each interval $1000 and above. Lacking more detailed information about them, we can estimate the total cost of these additional orders to be APPROXIMATELY

A. $23,800 B. $76,100 C. $81,000 D. $123,800