Evaluate (35/2)% of 800gm — (45/2)% of 400gm
$$\frac{35}{2}\% of 800g-\frac{45}{2}\%of 400g$$
=$$\frac{35}{2}\times\frac{1}{100}\times100-\frac{45}{2}\times\frac{1}{100}\times{400}$$
=140-90=50g
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