What number can be 50% of another number, while the 50% of that number is 75% of another number WITHOUT repeating digits? (1-2 digits for each number)

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?

Y+ 2/y is it a polynomial in one variable or not? and if so, why?

What is the equation of a line that passes through points (0, 4) and (-4,-8)?