关于11L1-S2-R5的一道题 calculator, investment, compound, return, period

ingridx

using a financial calculator,calculate the FV of a $300 investment(PV),given you earn a compound rate of return (I/Y)of 8% over a 10-year(N)period of time.

N=10 I/Y=8 PV=300 CPT FV=$647.688(ignore the sign)

想问一下老师 为什么计算出来会有负号？代表什么呢？不太明白。