A bicycle for sale costs $220.71, which includes 5.1% sales tax. What was the cost before sales tax? Assume the bicycle's price before sales tax is p dollars. Write an equation to model this scenario. There is no need to solve it.​

Ian is in training for a national hot dog eating contest on the 4th of july. on his first day of training, he eats 4 hot dogs. each day, he plans to eat 110% of the number of hot dogs he ate the previous day. write an explicit formula that could be used to find the number of hot dogs ian will eat on any particular day.