Solve for x I am totally confused on this can someone help me asap

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

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?

How do you solve a question like this?