book Maths Puzzle Numerical Ability

The sales price of a car is $12,590, which is 20% off the original price. What is the original price?
I am having a hard time putting this on paper, can you help?

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book Other Question

Please help me to solve this equation below
If f(4)=0 and f(6)=6,which of the following could represent f(x)?
A. 2:3x-4
B. x+2
C. x-4
D. 3:2x+6
E. 3X-12 the line 2x+3y=1 intersects the curve x(x+y)=10 at A and B.Calculate the coordinates of A and of B.