total cost = 600 - 600 x 0.32 . o- R. @) g; U% C- S8 D! `4 q8 Ntotal gain = E - 0.5 x 0.32 E + R* n W7 n# g+ r& F1 OTherefore E = 4859 A9 Z5 S# x& y7 N5 `
4.85% gain can balance the interest cost.
假设 " c3 H8 _) j3 ]2 z; b, i, O& ` 7 z: j+ ^' Y& n5 U i- 投资于增值收益选项 (非生产投资), 利息不能抵税 1 p; J a! ]; a- 投资收益不对边际税率(32%)产生影响8 S' Z j$ d% A. I
6 F; Q+ y, L7 u. DEarning = (principal x interest 6%) / (1-(capital gain payable tax 0.5 x marginal tax 0.32)) 1 i F4 x( E2 }) _5 m. [& C9 I! P7 @
% u& r8 c4 a* D) U
Break even % = Earning / Principal ( U( {* N8 {3 e- D& B/ j0 @ 9 P. h5 E* t3 j, Q7 p' ] }7.142857%7 j1 z( s. E8 Z; z