A medical technician is trying to determine what percentage of a patient's artery is blocked by plaque. To do this, she measures the blood pressure just before the region of blockage and finds that it is 1.20×104 Pa, while in the region of blockage it is 1.15×104 Pa. Furthermore, she knows that blood flowing through the normal artery just before the point of blockage is traveling at 30.0 cm/s [.3 m/s], and the specific gravity of this patient's blood is 1.06.
What percentage of the cross-sectional area of the patient's artery is blocked by the plaque?
*I'm not even sure where to start for this problem. There are no examples like it in my book...*