0.4×(8/5-3/8÷37.5℅)=0.4×(8/5-3/8÷3/8)=0.4×(8/5-1)=2/5×3/5=6/25
0.4×(8/5-3/8÷37.5%)=0.4×(1.6-3/8÷3/8)=0.4×0.6=0.24
