Appendix G: HP-80 Calculation Formulas

Discounted Cash Flow Analysis

PV0 = original investment  
PVk = cash flow of kth period  
i = decimal discount rate per period  
NPVk = net present value at k  

Notes

Accrued Interest (simple interest)
n = total number of days  
i = decimal interest on annual basis  
D = discount amount  
Yield = decimal effective interest on discounted note  

Discounted notes

Trend Line

S = slope  
Y0 = intercept at time zero  
K = time periods (k = 1, 2, 3, ... )  
Yk = value at time k  
N = total number of data points  
77