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If 3$8 = -50, 3$5 = -20 and 2$3 = -10, t...

If 3$8 = -50, 3$5 = -20 and 2$3 = -10, then find the value of 9$1 = ?

A

(a) 10

B

(b) `-20`

C

(c) 90

D

(d) 80

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