Sales tax was 7.5% how much did tammys lunch cost before tax if the tax on it was 0.72? define a variable and write an equation

The cost of Tammy lunch is 9.6 unit .

Step-by-step explanation:

Given as :

The percentage of sales tax = 7.5 %

The tax amount on cost = 0.72

Let the cost of Tammys lunch = x unit

So,

∵ The sales tax is applied on the cost

∴ 7.5 % of x = 0.72

Or, 0.075 × x = 0.72

Or, x =

∴    x  = 9.6 unit

Hence The cost of Tammy lunch is 9.6 unit .   Answer

geometry: triangles

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lessons

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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

the answer is 13 cm