3.54×0.29-2.9×0.254=3.54×0.29-0.254×10×2.9×0.1=3.54×0.29-2.54×0.29=0.29×(3.54-2.54)=0.29
3.54-0.29-2.9X0.254=3.54-0.29x(1+10X0.254)=3.54-0.29X3.54=3.54X(1-2.9)=3.54x0.1=0.354