C.P. of goods for the trader = Rs.22520
S.P. = 125 x 22520 = Rs.28150
∴ Profit = Rs.5630
Now, 5630 = 0.0536 x 5000 + 0.085 x 10000 + (x/100)* 7520
=>5630 =268 - 850 + 75.2x
=>75.2x = Rs.4512, which is nothing but profit from sale of third lot.
Saved in this browser. Nothing changes for anyone else.