(1+30%)x=4/5x+300

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(1+30%)x=4/5x+300(1+30%)x=4/5x+300(1+30%)x=4/5x+300即1.3x=0.8x+3001.3x-0.8x=3000.5x=300x=300÷0.5x=600

(1+30%)x=4/5x+300
(1+30%)x=4/5x+300

(1+30%)x=4/5x+300
即1.3x=0.8x+300
1.3x-0.8x=300
0.5x=300
x=300÷0.5
x=600