Sara, emma, and anna are buying party decorations. sara is paying 1 2 of the total cost. emma contributes 1 3 of the money, and anna contributes 1 4 . when they arrive at the checkout line, they realize that there is sales tax on the purchase. luckily, they have exactly the right amount of money to pay for the decorations. 1) which fraction represents the amount of tax added to the cost of the items?