Total proportion is 6+7+8 = 21
6⋅1050021\frac{6 \cdot 10500}{21}216⋅10500 = 3000
7⋅1050021\frac{7 \cdot 10500}{21}217⋅10500 = 3500
8⋅1050021\frac{8 \cdot 10500}{21}218⋅10500 = 4000
The largest share is 4000
