Please help me check my homework answer. If it is wrong, please explain to me please. Thank you

PROBLEM 2. In the diagram below, the marginal benefit schedule MB is linear. tA 200 MB 100 100 200 Quantity QUESTIONS: . In the above diagram, shade the area representing B(100), the (gross) benefit of consuming 100 units. . Calculate the dollar amount of B(100). B= 100. 100 = 10050