n*0.045+2n*0,050+(1,000,000-3n)*0,040=45,500
n*0.145-n*0.120=45,500-40,000
n*0.025=5,500
n=5,500/0.025
n=220,000Â in short-term notes paying 4.5%
2n=440.000Â in government bonds paying 5%
1,000,000-3n=1,000,000-660,000=440,000Â in utility bonds paying 4% Â