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Suppose , number of lemons bought
= LCM of 2,5,3 = 30
$\therefore$ CP=$(\frac{1}{2}\times 30)= 15 Rs.$
SP=$(\frac{3}{5}\times 30)=18 Rs.$
$\therefore$ Gain= 3 Rs.
$\therefore$ Gain percent =$\frac{3}{15}\times 100= 20$%