Gopi goes from place A to B to bye an article costing 15% less at B, although he spends Rs. 150 on travelling, still he gains Rs. 150 compared to buying it at A. His profit percent is = ?

Answer: Option C

Let price at A = 100x
After
Then price at B = 85x → 15%
Discount
According to the question,
100x - (85x + 150) = 150
15x = 300
x = 20
Price at A = 100 × 20 = 2000
Price at B including travelling charges
= 85x = 150
= 85 × 20 + 150
= 1700 + 150
= 1850
$$\begin{array}{rl}& \text{Percentage profit }\\ & =\frac{2000-1850}{2000}\times 100\\ & =\frac{150}{2000}\times 100\\ & =7.5\%\end{array}$$