A1: 30
A2: 35
A3: 40
A4: 45
A5: 50
A6: 55
A7: 60
B1: 9.8
B2: 8.2
B3: 7
B4: 6.1
B5: 5.4
B6: 4.9
B7: 4.5
AA: (A1, B1)
BB: (A2, B2)
C: (A3, B3)
D: (A4, B4)
E: (A5, B5)
F: (A6, B6)
G: (A7, B7)
L: {AA, BB, C, D, E, F, G}
a = 215 (slider from 200 to 300, step 5)
b = 2 (slider from 0 to 10, step 1)
f(x) = If[30 ≤ x ≤ 60, a / (x - b)]