Posted by meshelle on Thursday, December 4, 2008 at 9:22pm.
Interest equals principal times rate times time.
I = p * r * t
3.75 = 500 * 0.015 * t
3.75 = 7.5t
3.75/7.5 = t
0.5 = t
0.5 = 1/2 year
Check this site.
http://math.about.com/od/businessmath/ss/Interest.htm
Use interest = principle x rate x time.
I'm not sure what you mean by "base."
Principle here is $500, rate is 1.5%, and interest is $3.75.
Can you solve it from here?
I still do not understand.
Try to specific and tell us what exactly you do not understand
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