Answer:
Weight of Stock A is 55,88%
Explanation:
We know Weight Stock A + Weight Stock B =1 so, Stock B=1- Stock A
(Stock A*11.7) +(Stock B* 8.3)=10.2
(Stock A*11.7) +((1- Stock A)* 8.3)=10.2
(11.7 Stock A) +(8.3- 8.3 Stock A)=10.2
(11.7 Stock A) - 8.3 Stock A=10.2-8.3
3,4 Stock A=1,9
Stock A=1,9/3,4=0,5588 55,88%