Book. Table
Cp. 1000. 2000
SP = 1000(100+x)/100
Mp 2000(100+2x)/100

SP=20(100+2x)(100-x)/100

1000(100+x)/100+2000(100+2x)(100-x)/100*100

= 3000(100+(3x-16/300)

1000+10x +2(100+2x)(100-x)/10
= 3000(100+(3x-16/300)

1000+10x +2(10000+2000-2x^2)/100

= 3000(300+(3x-16/300)

5000+50x +(10000+100x-2x^2)

5000+50x +10000+100x-2x^2

= 15000+150x-800

150x - 2x^2 =150x - 800
X^2 = 400
X = 20%✅