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A solution containing 0.0837 M caffeine and 0.0666 M niacin as the internal standard gave R = 423 and R = 347. To analyze a caffeine tablet, 20.0 mL caff niacin 0.146 M niacin and 20.0 mL of caffeine tablet solution were mixed and diluted to 50.0 mL in a VF. Instrument gave R = 553 and R = 582. What is the caff niacin concentration of caffeine in the 20.0 mL caffeine solution?

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