Let C be the total charge and t be the rental time in hours.
C = ht + 43
Plugging the given values into the equation, we get:
64 = 7h + 43
7h = 21
h = 3
The hourly fee is $3.00 per hour.
So firstly, add both sides by 6: 
Next, multiply both sides by 4, and your answer will be 
Answer:
.3%, 21/7000=.003
Step-by-step explanation:
to make it by percent you multipy by 100