22×{1+5/10×[2+25/100:(3/8-1/10)] }=22×{1+1/2×[2+25/100: (30/80-8/80)]}= 22×[1+1/2×(2+25/100:22/80)]= 22×[1+1/2×(20/10+25/100×80/22)]=22×[1+1/2×(2+25×4/110)]= 22×[1+1/2×(22/11+100/110)]= 22×[1+1/2×(22+10)/11]= 22×(1+1/2×32/11)= 22×(1+16/11)= 22×(11/11+16/11)=22×(11+16)/11= 22×27/11=2×27=54
