50 dollars - 10 dollars
40 dollars is left.
= 
The 2 right triangles are similar and so the ratios of corresponding sides are equal
The corresponding sides are x and 2, 6 and 1.5, hence
= 
Answer:
3.16
Step-by-step explanation:
The answer would be a. 9/10 after simplifying 18/20 which is what you get after getting your common denominator.