Ans.16$\frac{2}{3}$%
At 25% profit
If cost price is Tk 100, then selling price would be 125 Tk.
If selling price is 125 tk. then cost price would be = 100 Tk
If selling price is 4000 tk. then cost price would be = $\frac{100×4000}{125}$ = 3,200 Tk.
Total cost price of two commodities = 4,000 + 4,000 = 8,000 Tk.
Then the cost price of another commodity = 8,000 -3,200 = 4,800 Tk.
But the sold another commodities = 4,000 Tk
So he loses = 4,800 — 4,000 = 800 Tk.
Loss % = $\frac{800}{4800}\times 100$ = $\frac{2}{3}$%
ans: Monthly income of P is 4,000 Tk.
Given, average income of P & Q = 5050 Tk.
Sum of their income = 5050 x 2 = 10,100 Tk.
P + Q = 10100………………………………. (i)
Average monthly income of Q & R = 6,250 Tk.
Sum of their income = 6250 x 2 = 12,500 Tk.
Q + R = 12,500 …………………….(ii)
And average monthly income of P & R is 5,200 Tk
Sum of their income = 5,200 x 2 = 10,400 Tk.
P + R = 10,400 ……………………..(iii)
Subtracting equ” (i) from equ” (ii) we get
Q + R = 12,500
P + Q = 10.100
R – P = 2,400
=>R = 2,400 + P
Putting the value of R in equ” (iii), we get
P + R = 10,400
=> P + 2,400 + P = 10,400
=> 2P = 8,000
P = 4,000
