Answer with Step-by-step explanation:
Bob worked 15 consecutive day, earning an average wage of $90 per day.
Total wage for 15 days= $(90×15)
                  = $1350
During the first 7 days his average was $87/day
Total wage for first 7 days=$(87×7)
                 = $609
During the last 7 days was $92/day.
Total wage for last 7 days= $(92×7)
                     = $644
Total wage for 15 days=Total wage of first 15 days+ Total wage of 8th day+ Total wage for last 7 days
⇒ 1350 = 609+wage of 8th day+ 644         Â
⇒ wage of 8th day=1350-609-644
⇒ wage of 8th day=$97
Hence, Correct option is:
C. $97
