B : SJ … S : BJ

3 : 5 … 1 : 5

The total units for BSJ must be the same. Common multiple for 8 and 6 is 24.
So the new ratio is
B : SJ … S : BJ
9 : 15 … 4 : 20

B = 9u so J = 20u - 9u = 11u
2u = $20
24u = $20 x 12
= $240