Henry counted 350 lockers haily counted 403 lockers how does the 3 in 350 c ompare to the 3 in 403

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?

Which representation has a constant of variation of -2.5

Math it's appreciated. (picture provided)