Days to Xmas dt(25 Dec 2006) - dt(12 Dec 2006) TD #Cost of Xmas presents 13 +23 -25 +65 -200 +23 -25 +65 -202 +873 +23 -25 +65 N #Yearly income ( 5 * 8_hours_per_day * 40_weeks_worked * 50_dollars_per_hour ) C #Tax rate 36_percent N After tax monthly income ({#Yearly income}*(1-{#Tax rate}/100))/12 C #Monthly expenses 44 +400/2*52/12 +230 C Money left after Xmas {After tax monthly income} - {#Monthly expenses} - {#Cost of Xmas presents} C