How about 3.24 × 0.16 + 0.0324 × 84?

How about 3.24 × 0.16 + 0.0324 × 84?

3.24×0.16+0.0324×84
=3.24×0.16+3.24×0.84
=3.24×(0.16+0.84)
=3.24