Answer: Let the principal amount she sets a side in an investment be $ P
She retires at an age of 65 , that is , in 35 years from the date of investment .
Period of investment = 35 years
rate of interest =6% per annum =( 6/365)% = 0.016438 % per day
r = 0.016438%
n= number of time the interest is compound
As compounding is done each day ,
Maturity Amount = 1,200,000$ =P
⇒ =
P= $1200000/8.1644=14697$