(1-40%)x-(1-40%)x×(1-20%)=60

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(1-40%)x-(1-40%)x×(1-20%)=60(1-40%)x-(1-40%)x×(1-20%)=60(1-40%)x-(1-40%)x×(1-20%)=60(1-40%)x-(1-40%)

(1-40%)x-(1-40%)x×(1-20%)=60
(1-40%)x-(1-40%)x×(1-20%)=60

(1-40%)x-(1-40%)x×(1-20%)=60
(1-40%)x-(1-40%)xx(1-20%)=60
(1-40%)x20%x=60
60%x20%x=60
x=500

1-40%)x-(1-40%)x×(1-20%)=60
(1-40%)x×0.2=60
0.6×0.2x=60
x=500