也就是什么时候利息能到200每三个月。你就算算在.16的利率下，要多少钱才能达到每三个月200的利息，然后倒推在同样的利息下，要存多少次100
the key to solve this is the furture value of those deposits equals to the present value of those withdrawals:
thus,
FV (annuity) = C / R ( (1+r)^t -1) ===== PV (perpetuity) = C/R
bear in mind, the compouds are 1/4 year, so the true r is 0.04
however, I get t = 28 based on your info.
QED
future discussion is welcomed, good luck
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