Question 1125329
rule of 69/70 is doubling time in years is 69 or 70 (or even 72)/3.45, the per cent rate.  That is 20 years, strongly suggesting the money will double

P=Poe^(rt)=82000*e^(0.0345*20), where e^(0.69)=1.994, almost 2
so P=$163,484.67




P=25000(1+0.0435/365)^47=$25140.42
+$2000=$27140.42 on 17 Feb
27140.42(1+(.0435/365)^16=$27292.86
-$5000=$22292.86 on 5 March
22292.86(1+0.0435/365)^27=$22,364.71