You have a coupon that states you buy one item at cost, and the second item is 50% off equal or lesser value. you buy a pair of jeans that cost $48 and a shirt for $22, how much will you pay before tax?

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.