What number has the same value as 50 tens

15 points ! ~ see if you know the answer to both you!

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

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.