Determining the original amount borrowed

If an amount was borrowed 5 years ago at 6% compounded quarterly, and $6000 is owed now, what was the original amound borrowed?

Since:
Future Value = Principal (1+r)^n
you can solve for principal, where the periodic rate "r" = 0.06 / 4qtrs = 0.015, and n = 5yrs * 4 qtrs = 20...

6000 = Principal(1.015^2)
6000 = P (1.34686)
P = $4,454.82

6000/(1.015)^20
4454.82

1.015 is 100% + 6%/4, compounded 4 times a year, 20 times in 5 years