0.25×1.9+1/4×3.1+25%×15
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0.25×1.9+1/4×3.1+25%×15
=0.25×1.9+0.25×3.1+0.25×15
=0.25×(1.9+3.1+15)
=0.25×20
=5
=0.25×1.9+0.25×3.1+0.25×15
=0.25×(1.9+3.1+15)
=0.25×20
=5
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