[3.25*(4.7-3.5)]/1.25=3.25x(4.7-3.5)/1.25=3.25x1.2/1.25=3.25x(1+0.2)/1.25=(3.25+0.65)/1.25=3.9/1.25=39/10/(5/4)=39/10x4/5=78/25=3.12
