Elite dora and then went to an office supply store together evil dora by 15 boxes of paper clips and 7 packages of index cards for a total cost of $55.40 when bought 4 boxes of paper clips and 10 packages of index cards for a total cost of $61.70 find the cost of one box of paper plates and the cost of one package of index cards

the final amount you will pay is $68.04.

the tip is determined by the pre-tax amount, so we calculate the tip based on the original bill, not after we've added sales tax.

to find the tip:

we can divide 54.00 by 100 to get 1% of 54. then we multiply that by 18.

54 / 100 = .54

.54 x 18 = 9.72

tip = 9.72$

to find the tax:

we can divide 54.00 by 100 to get 1% of 54. then we can multiply that by 8 to get 8%.

54 / 100 = .54

.54 x 8 = 4.32

tax= 4.32

now we can add the tip and tax to the bill to get our total.

54 + 9.72 + 4.32 = 68.04

total: $68.04

step-by-step explanation:

answer: 12   they all have at least 28 days

step-by-step explanation: haha