What annual investment is required at 8% per year compounded annually to accumulate to $100,000 at the end of 20 years?

P = $ 38,461.54

Equation:
P = A / (1 + rt)
Calculation:
First, converting R percent to r a decimal
r = R/100 = 8%/100 = 0.08 per year,
then, solving our equation

P = 100000 / ( 1 + (0.08 × 20)) = 38461.538461538
P = $ 38,461.54

The principal investment required to get
a total amount, principal plus interest, of $ 100,000.00
from simple interest
at a rate of 8% per year
for 20 years is $ 38,461.54.