What is 2/3 - 5/12 x 9/20 divided by3/4

Which of the following properties can be used to show

Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian bought 4 bottles of water and 1 cup of coffee for his family for $7.15. how much does each bottle of water cost? how much does each cup of coffee cost? i need this done

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup