(0.4-x)x2=0.4x(1+50%)

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(0.4-x)x2=0.4x(1+50%)(0.4-x)x2=0.4x(1+50%)(0.4-x)x2=0.4x(1+50%)(0.4-x)x2=0.4x(1+50%)0.8-2x=0.4x1.50.

(0.4-x)x2=0.4x(1+50%)
(0.4-x)x2=0.4x(1+50%)

(0.4-x)x2=0.4x(1+50%)
(0.4-x)x2=0.4x(1+50%)
0.8-2x=0.4x1.5
0.8-2x=0.6
0.8=0.6+2x
0.6+2x=0.8
2x=0.8-0.6
2x=0.2
x=0.2÷2
x=0.1