The value of x is computed as shown below:
1 - 1 / ( 1 + x ) 20 = 0.45
( 1 + x )20 - 1 = 0.45 ( 1 + x )20
0.55 ( 1 + x )20 = 1
(1 + x)20 = 1 / 0.55
(1 + x)20 = 1.818181818
1 + x = ( 1.818181818 ) 1 / 20
1 + x = 1.030343096
x = 0.030343096
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