Cindy and her friends went out to breakfast. The total bill came to $49.87. They have to pay 6.2% sales tax and want to leave a 18% tip. What was the final cost of the bill?

$60.94

Step-by-step explanation:

49.87+11.07(the total of tax plus tip)=60.94

geometry: triangles

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call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

25.45584

0lz try yourself sorry for not answering