Formula support

[davem1545]

C	D	E	F	G	H	I	J	K
$     0.0355	32	64000	2000	$                    640	$          0.010	$          2,272	$            71	71.8%

I need a formula that changes K to 80% while automatically changing C. The current formula for K is:

=(C-H)/C. How do I get C to change automatically by raising or lowering K?

[#2]

@davem1545 

Enter the following formula in C1:

=5*H1