Laura is going to buy a car. The total cost of the car is £22000 plus VAT at 20%

Laura pays 8400 deposit then pays the rest in 36 equal monthly payments.
Work out the total of each monthly payment

the answer is d. 75%

9 x 8 divided by (5-3)=36

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