The number of pancakes y is proportional to the cups of pancake mix × that is used to
make the pancake batter. The pancake
batter will make 10 pancakes when 2 cups
of pancake mix is used. Write an equation
that represents the situation.

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?