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Option 4 : All I, II and III are sufficient.

Given:

There are 3 statements given in order to find out the total monthly income of Asha.

I. Asha's basic income is ₹ 100 more than that of Mala who works in her office.

II. Mala's basic income is ₹1,550 per month.

III. Mala took out additional allowance of ₹2,000 per month from her income which is ₹50 less than Asha's income.

Calculation:

Statement I: 

Asha's basic income = Rs.100 + Mala's income 

∴ Statement I alone is not sufficient to find out Asha's total monthly income.

Statement II:

Mala's basic income = Rs.1550 per month

∴ Statement II alone is not sufficient to find out Asha's total monthly income.

Statement III:

Mala's additional allowance per month = Rs.2000 

Asha's additional allowance per month = Rs.2050 

Statement I and II: 

Asha's basic income = Rs.1550 + Rs.100 = Rs.1650 

∴ Statements I and II are not sufficient to find out the total monthly income of Asha.

Statements I, II and III:

Asha's basic income = Rs.1650 

Asha's additional allowance per month = Rs.2050 

Asha's total monthly income = Rs.1650 + Rs.2050 

⇒ Rs.3700 

∴ Statements I, II and III all are sufficient to find out the total monthly income of Asha.

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