Question

Bill Moore is buying a used Winnebago. His April monthly interest at 12%

Answer 1

30 days hath september, april, june and november, etc.
so you could use the 30 days which is 1/12 of 360

OR you could just use the fact that one month is 1/12 of the year

in either case the interest is 1%
0.01x = 125
x=12500