Answer:
N$1800 = PxX ≤ PyY
Step-by-step explanation:
Utility is the sanctification a consumer services from consuming a good or a service.
An utility function measures the preferences of a consumer over a set of goods or services.
given income of $1,800 and prices px and py, a consumer has to choose a bundle of good that maximises utility given income as total expenditure cannot exceed income