Teddy the tortoise arrives with his owner this afternoon to…

Teddy the tortoise arrives with his owner this afternoon to receive an injection of enrofloxacin. One mg of enrofloxacin costs the clinic $0.25. The markup set for each mg of enrofloxacin is set to 140%. Teddy weight is 850g and needs 10mg/kg injection. Enrofloxacin concentration is 2.27%. Teddy’s owner final bill was $8. How much did he pay as an injection fee?   Do not write the dollar sign.