HP HP12C hp 12c_user's guide_English_E_HDPMBF12E44.pdf - Page 192

192 Appendix D: Formulas Used r= ⎢⎣⎡∑ xy − ∑ x ⋅∑ n y ⎤ ⎥⎦ ⎡ ⎢∑ ⎢⎣ x2 − (∑ x )2 n ⋅ ⎡ ⎢∑ y 2 ⎢⎣ − (∑ y )2 n Standard Deviation sx = n∑ x 2 − (∑ x )2 n(n − 1) sy = n∑ y 2 − (∑ y )2 n(n − 1) Factorial 0! = 1 For n > 1 where n is an integer: n n!= ∏i i =1 The Rent or Buy Decision Market Value = PRICE(1 + I)n where: I = appreciation per year (as decimal) n = number of years Net Cash Proceeds on Resale = Market Value - Mortgage Balance - Commission The interest rate is obtained by solving the financial (compound interest) equation for i using: n = number of years house is owned PV = down payment + closing costs PMT = mortgage payment + taxes + maintenance - rent - (% tax) (interest + taxes) FV = net cash proceeds on resale Annual interest rate = 12 × i File name: hp 12c_user's guide_English_HDPMBF12E44 Printered Date: 2005/7/29 Page: 192 of 209 Dimension: 14.8 cm x 21 cm