This is exponential growth/decay function, in this case decay, of the form:
f=ir^t, f=final value, i=initial value, r=common ratio or "rate", and t=times rate is applied or "time".
In this case i=2100 and r=(100-14)/100=0.86 so the equation is:
f=2100(0.86^t) and in five years...
f(5)=2100(0.86^5)
f(5)≈$987.90 (to nearest whole cent)
