Step-by-step explanation: First do 3,500 divided by 10 to find the cost of each shirt. Second subtract 7 from 10 which is 3. Then divide 3 by ten because you always divide by the amount being paid for. So 3 divided by 10 is .3 then multiply .3 by 100 which is 30 and that is your percent markup
10/8 can be simplified to 5/4, which is the same as 1.25 (divide numerator 5 by denominator 4). So you have x>1.25. All numbers greater than 1.25 are possible solutions.
