claim: ( Multiplying .95 by itself 15 times yields 46.3 percent. )”
evidence: The value of an investment is doubled if the return r { \displaystyle r } = +100%, that is, if r l o g { \displaystyle r { \mathrm { log }  } } = ln( $200  /  $100 ) = ln( 2 ) = 69.3%.