Answer:
cost for each hour her car was parked in garage = $3
Step-by-step explanation:
Let the cost every hour car parked in garage be x.
4x + $77.50 = $89.50 ......4* x because the car had been 4 hours in garage.
4x = $89.50 - $77.50
4x = $12
x = $12 / 4
x = $3