Given that, a = 20 and b = 15
According to the formula,
Profit %= [(a - b) / b] x 100 %

Correct Option: B

Given that, a = 20 and b = 15
According to the formula,
Profit %= [(a - b) / b] x 100 %
= (5/15) x 100% = 100/3 %
= 33¹/₃%

Required loss = (a/10)² %

Correct Option: A

Required loss = (a/10)²%
= (20/10)²% = 4%
Thus, seller gets 4% loss in the deal.

Let CP of the article be ₹ N,
Then 106% of N - 94% of N = 6

Correct Option: B

Let CP of the article be ₹ N,
Then 106% of N - 94% of N = 6
⇒ 12% of N = 6
∴ N = (6 x 100)/12 = ₹ 50

Here, a = 20%
∴ Total loss percentage = a²/100 %

Correct Option: D

Here, a = 20%
∴ Total loss percentage = a²/100 %
= (20 x 20)/100
= 4%

Let A purchased the watch for ₹ N
A x [(1+ r₁) /100] x [(1+ r₂) /100] = CP of article given by C

Correct Option: A

Let A purchased the watch for ₹ N
A x [(1+ r₁) /100] x [(1+ r₂) /100] = CP of article given by C

⇒ N x (140/100) x (80/100) = 432
∴ N = (432 x 100)/(14 x 8) = ₹ 385.71