Machine $A$ can produce $50$ components a day while machine $B$ only $40.$ The monthly maintenance cost for mach

Machine $A$ can produce $50$ components a day while machine $B$ only $40.$ The monthly maintenance cost for machine $A$ is $\$1500$ while that for machine $B$ is $\$550.$ If each component generates an income of $\$10$ what is the least number of days per month that the plant has to work to justify the usage of machine $A$ instead of machine $B?$

(A) 6
(B) 7
(C) 9
(D) 10
(E) 11

Answer: D

Source: GMAT Club Tests

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