D pays 40000 Rs C sells to D at a loss of 30% So, amount payed by C = 40000 x 100 / (100 - 70) = 40000 x 100 / 70 = 57142.85 Rs B sells to C at a profit of 25% So, amount payed by B = 57142.85 x 100 / (100 + 25) = 57142.85 x 100 / 125 = 45714.29 Rs A sells to B at a profit of 20% So, amount payed by A = 45714.29 x 100 / (100 + 20) = 45714.29 x 100 / 120 = 38095.24 Rs The total profit of A = (Amount payed by A) - (Amount recieved by A when he sold it to B) = 45714.29 - 38095.24 = 3809.52 Rs