0.32*12.5=0.8*12.5*0.4
=10*0.4
=4
4.5*1.02=4.5*1+4.5*0.02
=4.5+0.09
=4.59
73.6*0.99=73.6*1-73.6*0.01
=73.6-0.736
=72.864