Finding SP without Finding Discount Percentage

Q. An article passes successfully in the hand of three traders. Each trader sold it further at a gain of 20% of the cost price. If the last trader sold it for Rs 432 then what was the cost price?

Q.

A shopkeeper offers 2.5% discount on cash purchases. What cash amount would Rohan pay for a cycle, the marked price of which is Rs. 650?

1. Rs. 633.25

2. Rs. 635

3. Rs.637

4. Rs. 633.75

Q. A shopkeeper offers his customers $10\%$ discount and still makes a profit of $26\%$. What is the actual cost of an article marked Rs. 280? [4 MARKS]