Filipe went on the roller coaster 4 times and the gravity free-fall once, for a total of $24.00. Luiza went on the roller coaster four times and the gravity free-fall twice, for a total of $30.00.
How much does one ride on the gravity free-fall cost?
A. $30.00
B. $12.00
C. $6.00
D. $8.00