The average expenditure of a person for first five months is Rs.1700 and next seven months is Rs.1800. If he saves
Rs.2900 in these twelve months, then what is the average monthly income of the person?

The average expenditure of a person for first five months is Rs.1700

For next seven months is Rs.1800

​Expenditure for first 5 months =1700×5=8500 Rs.

Expenditure for next 7 months = 1800×7=12,600 Rs.

Total expenditure for 12 months = 8500+12,600=21,100 Rs.

Total income =Total expenditure + Savings=21,100+2900=24,000 Rs.

Average monthly income =$$\frac{24,000}{12} = 2,000$$

Thus, the correct answer is option (d) 2,000