n problem, Pa = $20, Pb = $10, MBa = 400, and MBb = 600, and one unit of B is taken away, how many units of A must be added to keep benefits constant?...

If, in a constrained minimization problem, Pa = $20, Pb = $10, MBa = 400, and MBb = 600, and one unit of B is taken away, how many units of A must be added to keep benefits constant?Do NOT include any symbols other than a decimal point or negative sign, as needed. If including a negative sign, do NOT leave a space between it and the number. For example, if your answer is $1,234.56, enter it as