Calculating constant of elasticity of springs in a car

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Homework Statement
There's a car of 500 kg, and a man of 60 kg enters the car. When this happens, the centre of mass of the car goes down $0,3 cm$.
Determine the constant of elasticity of the springs
Homework Equations
Newton's and Hooke's equations
When my professor solved it, he wrote $k$ in the equations. But there are four springs, so why didn't he write $4k$?

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hutchphd

If he is talking about each spring individually he needs either to divide the weight by four or multiply the k by 4..

"Calculating constant of elasticity of springs in a car"

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