You can
put this solution on YOUR website! A riding stable borrowed $1,000 at a cost of $15 interest. If the loan was made at 6% simple interest, the length of the loan was:
a. 9 months
b. 90 days
c. 25 days
d. 4 days

, where I = interest, P=principle(money borrowed in this case), r=rate, and t=time in years (they count a year as 360 days for some reason.)

I=15, P=1000, and r=6/100=.06

1/4 of a year is

days
t=90 days (b)
Happy Calculating!!!