On July 5th six different people reported to the police that they had seen Bigfoot, the

large hairy creature sometimes seen but never captured. The next day, twice as many
people called the police; sure they had seen the creature. Each day the police
received twice as many phone calls as the day before. After they got a total of more
than 300 phone calls, the police took the phone off the hook! On what day did the
police receive their 300th phone call?

6, 12, 24, 48, 96, 292,

Take it from there.