A car gets 28 miles to the gallon. If it is modified to use a solar panel, it will use only 80 percent as much fuel as it does now. If the fuel tank holds 15 gallons, how many more miles will the car be able to travel, per full tank of fuel, after it has been modified? Choose the most appropriate option:
A) 85	B) 90	C) 95	D) 100	E) 105

Rationale: "originally , the distance the car could go on a full tank was 15 * 28 = 420 miles . after it has been modified , the car can go 28 / 0.8 = 35 miles per gallon . on a full tank , the car can go 15 * 35 = 525 miles , thus 105 miles more . the answer is e ."
Answer: E