4. (01.02) The number of cars (c) in a parking lot increases when the parking fee () decreases. Write the correct equation for this scenario, and solve for the number of cars when the fee is $6.
Fee
20
30
Cars
15
10
(1 point)
Oc-
300
;C-50
o
C
300
-;C=50
O c = 3f;c - 18
O c = 3f; c = 2