Simplest form 9/10-4/10 ?

Regular price is $77.00 and the discount is 5% find the sale price

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?

Segment xy is dilated through point m with a scale factor of 2. which segment shows the correct result of the dilation