The percentage of metals in a mine of lead ore is 60%. Now the percentage of silver is 3/4 % of metals and the rest is lead. If the mass of ore extracted from this mine is 8000 kg, the mass (in kg.) of lead is :

Answer: Option B

Mass of lead ore = 8000 kg
⇒ Mass of metal in lead ore
= 60% of 8000
= 4800 kg
⇒ Mass of silver in metal
= $$\frac{3}{4}$$% of 4800
= 36 kg
⇒ Mass of lead in ore
= 4800 - 36
= 4764 kg