First off 3/9 and 6/9 are already common denominators. In some fractions you would need to find the least common denominator like in a problem like 1/2 + 4/5. Also 3/9 plus 6/9 results in 9/9 and 9/9 equals 1. Most fractions adding it subtracting results in a pan answer as a fraction but in this case it’s a whole number.
First, find the total price she would have had to pay (without tax): 2.75+ 3(2.5)+ 1.75=12 If she has half-price multiply the total price by 0.5: 12(.5)=6 Her total price without tax is $6.
