Answer: 30,000

Explanation:
Percentage of his expenditure spent on rent = 15%
=> Percentage of his expenditure spent on transport and food = 30%
=> 30% - 15% = 15% = Rs. 4500
=> Monthly expenses = 100%
=> 100/15(4500) = Rs. 30000

Answer: 16 2/3%

Explanation:
let his monthly income be Rs. x
Original savings = Rs. 10/100 x
New savings 10/100x + 20/100(10/100 x) = Rs. 12/100x
Original expenditure = x – 10/100 x = Rs. 90/100x
New expenditure
90/100x – 20/100(90x/100) =Rs. 72/100 x
Required percentage = 12/100x / 72/100x (100) = 16 2/3%

Answer: None of these

Explanation:
Expenditure on entertainment = 20% of 35% = 7% = 2100
1% = 300
Expenditure on education = 20% = Rs. 6000

Answer: 180

Explanation:
the expenditure on rent and others = 15% +35% = 50%
Required angle = 50/100(360) = 180

Answer: 20%

Explanation:
Decrease in expenditure on ‘others’
10500 – 10290 = Rs. 210
 Initial expenditure on clothes
 210 (100/10) = Rs. 2100
Required percentage = 2100 / 10500(100) = 20%