10.25/15 as a percentage?
10.25/15 = 0.68(3) ≈ 0.68
Percent means "per hundred". X percent means X/100.
So when you have a decimal that you want to convert into percentages, simply multiply by 100.
10.25/15 = 0.68(3) ≈ 0.68 = 68/100 = 68 %