To calculate this expression, follow the order of operations (parentheses, multiplication, division, addition, subtraction):

Calculate the value inside the parentheses first:
36.5 * 0.4 = 14.6
14.6 + 8.8 = 23.4

Calculate the division inside the parentheses:
23.4 / 0.5 = 46.8

Calculate the division in the main expression:
84.2 / 0.4 = 210.5

Subtract the result from Step 2 from the result in Step 3:
210.5 - 46.8 = 163.7

Therefore, the answer is 163.7.