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# A 0.24g sample of compound of oxygen and boron was found by analysis to contain 0.096g of boron and 0.144g of oxygen. Calculate the percentage composition of the compound by weight.

$$Percentage \ of \ boron =$$ $$mass \ of \ boron \over mass \ of \ the \ compound$$ $$× 100$$ $$=$$ $$0.096 \over 0.24$$ × 100 = 40%