A certain amount invested in a firm would become double at the end of one month,but it deducts an amount of Rs120 on every doubling. A person invests an amountof Rs105 and continues for 3 months without investing any additional amount.At the end of 3 months, his net income is :

Correct option is B

Let's analyze this step by step.

Given,

• An investment doubles at the end of each month.
• Rs120 is deducted on every doubling.
• Initial investment = Rs105.
• The investment continues for 3 months.

Month-by-month growth:

Month 1:

• Rs105 doubles → Rs210.
• Rs120 is deducted → Rs90 remains.

Month 2:

• Rs90 doubles → Rs180.
• Rs120 is deducted → Rs60 remains.

Month 3:

• Rs60 doubles → Rs120.
• Rs120 is deducted → Rs0 remains.

Thus, the person is left with Rs0 at the end of 3 months.

Correct answer: (B) Rs0.