RDP 2015-10: The Life of Australian Banknotes Equation (7)

F e i g e b a n k n o t e l i f e = M e a n s t o c k o f b a n k n o t e s o n i s s u e o v e r 12 m t h s ( A n n u a l s n o o f d e s t r u c t i o n + A n n u a l s n e w b a n k n o t e s i s s u e d ) / 2 = c ( a + d ) / 2 . MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGceaqabeaafaqabe GabaaabaGaamOraiaadwgacaWGPbGaam4zaiaadwgaaeaacaWGIbGa amyyaiaad6gacaWGRbGaamOBaiaad+gacaWG0bGaamyzaiaaykW7ca WGSbGaamyAaiaadAgacaWGLbaaaiabg2da9maalaaabaGaamytaiaa dwgacaWGHbGaamOBaiaaykW7caWGZbGaamiDaiaad+gacaWGJbGaam 4AaiaaykW7caWGVbGaamOzaiaaykW7caWGIbGaamyyaiaad6gacaWG RbGaamOBaiaad+gacaWG0bGaamyzaiaadohacaaMc8Uaam4Baiaad6 gacaaMc8UaamyAaiaadohacaWGZbGaamyDaiaadwgacaaMc8Uaam4B aiaadAhacaWGLbGaamOCaiaaykW7caaIXaGaaGOmaiaaykW7caWGTb GaamiDaiaadIgacaWGZbaabaWaaeWaaeaacaWGbbGaamOBaiaad6ga caWG1bGaamyyaiaadYgacaWGZbGaaGPaVlaad6gacaWGVbGaaGPaVl aad+gacaWGMbGaaGPaVlaadsgacaWGLbGaam4CaiaadshacaWGYbGa amyDaiaadogacaWG0bGaamyAaiaad+gacaWGUbGaey4kaSIaamyqai aad6gacaWGUbGaamyDaiaadggacaWGSbGaam4CaiaaykW7caWGUbGa amyzaiaadEhacaaMc8UaamOyaiaadggacaWGUbGaam4Aaiaad6gaca WGVbGaamiDaiaadwgacaWGZbGaaGPaVlaadMgacaWGZbGaam4Caiaa dwhacaWGLbGaamizaaGaayjkaiaawMcaaiaac+cacaaIYaaaaaqaai abg2da9maalaaabaGaam4yaaqaamaabmaabaGaamyyaiabgUcaRiaa dsgaaiaawIcacaGLPaaacaGGVaGaaGOmaaaacaGGUaaaaaa@B893@