Problem:  Mr. Akbar is a potato seller in a local bazaar. When he brings potatoes from the village market to his shop in the town, he has to pay a minimum of Tk 100 toll up to total sale of TK 1000. For any amount of sale above Tk 1000, he has to pay an additional toll of 7.5% on the incremental amount. If the total amount of toll paid was Tk. 257.50 then what was his total sales proceeds from the potatoes?

Correct Answer: ans: 3,100.

Explanation:

Let, the total sales be = x Tk.

=>100 + (x— 1000) x 7.5 % = 257.5

=>(X-100)$\times \frac{75}{100}$=257.50-100

So, X= 3100