Their use. Simple co-opera¬ tion is £3.

60=120 14+7=21 8 168 48 20+28 C 60+60=120 14+10,/.=241/j 5 »/, 140 20 20 D 60+60=120 16+12 =28 5‘/» 160 40 E 60+60=120 18+27=45 44/s 216 96 42+2x27 E 18+ 221/1=401/i 6 243 123 42+3x27 330 4x42+6x27 Second Case: 400c+150v+100s=650 250 662/3% 18*/„% In the case of a particular interest-bearing form; on the other hand, because the necessary.