Copy Conditional formatting to different formula

Hi,

I have the table attached which contains cumulative equation. For example, E3= 37, and C3 = E3+37 and so on.

I want the conditional formatting gets the value from the cell above it. If the value is grater than or equal the value in the above cell (-5) it should returns a green check mark . If the value between is less than the above cell from 6 to 20, the result should be yellow exclamation mark. And X mark if the value is less more than 20.

for clearance:

Assume the value in cell C3 = 100 and the value in C4 = 95 or more, the conditional result should be green check mark.
Assume the value in cell C3 = 100 and the value in C4 between 95 to 80, the conditional result should be exclamationcheck yellow mark.
Assume the value in cell C3 = 100 and the value in C4 less than 80, the conditional result should be cross red mark.