, ( ) : , , .
, ? , , , , . . . , , () () () . , , , , . . , .
, $100, . . . , $100, . , = 0.8, , 1 80 (. . 80%), 20 (. . 20%) (. . ms = 0.2). , $100 , $80 (Y∙m =100∙0.8 = 80) $20 (Y∙ms = 100∙0.2 = 20). ( ) $80 , $64 (Y∙m = 80∙0.8 = 64) $16 ( 80∙0.2 = 16) . . , 0.
, , :
( ) (m) . , , . . . () . 5 (1 / 1 0.8 = 5). , $100 $500 (100 5 = 500).
() . , , , , . . , , . . , ( ) .
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(, ) .11.4.
, , . , .
(m), . , , m = 0.9, = 10 (1 / (1 0.9) = 10), m = 0.75, = 4 (1 / (1 0.75) = 4). m , m, .
(. . m , , , ).