1) Nehir consumes brownie and ice-cream but only in the fixed ratio of two spoons of ice-cream to one portion of brownie. At any other ratio, the excess goods are useless to her. The cost of a portion of brownie is $10 and the cost of a spoon of ice-cream is $10. Nehir's income is $300.

a)Express Nehir's preferences for brownie and ice-cream graphically.

b) Express Nehir's preferences for brownie and ice-cream using a utility function.

c) How many portions of brownie and spoons of ice-cream does Nehir consume to maximize his utility? Show your work mathematically and graphically.