model 5 income & expenditure Section-Wise Topic Notes With Detailed Explanation And Example Questions

Answer: (b)

Savings = 100% - 66$2/3$%

= 33$1/3$% Since, 33$1/3$% ≡ Rs.1200

100% ≡ $1200/100 ×3 × 100$ = Rs.3600

Expenses = 3600 - 1200 = Rs.2400

Aliter : Using Rule 20,

{If a person saves ‘R' rupees after spending x% on food, y% on cloth and z% on entertainment of his income then,

Monthly income = $100/{100 - (x + y +z)}× R$}

Here, R = Rs.1200; x = 66$2/3$%

Monthly income = $100/{100 - 66{2}/3} × 1200$

= $100/{100 - 200/3} × 1200$

= $300/100 × 1200$ = Rs.3600

Expenses = Income – savings = 3600 – 1200 = 2400

Answer: (a)

Required percentage = $x/{100 - x} × 100$

= $40/60 × 100 = 200/3$= 66.66%

Answer: (c)

Let man's salary be Rs.x.

His expenditure on items of daily use

= $25/2% of x ={25×x}/200 = x/8$

So, remaining amount

=$ x - x/8 = Rs.{7x}/8$

Expenditure on house rent

= 30% of Rs.${7x}/8$

$30/100 × {7x}/8 = Rs.{21x}/80$

Now, remaining amount = ${7x}/8 - {21x}/80$

= ${70x - 21x}/80 = Rs.{49x}/80$

According to the question,

${49x}/80 = 2940$

x =${2940 × 80}/49$ = Rs.4800

Aliter : Using Rule 20,

His salary = ${100 × 2940}/{100 – (25/2 + 26.25)}$

= ${100 × 2940}/{100 – (12.5+ 26.25)}$

= $294000/61.25$ = Rs.4800

Answer: (b)

Let the required income be Rs.x Average monthly income

= Rs.$(80800/16)$ = Rs.5050

x = 120% of 5050

= Rs.$(120/100 × 5050)$ = Rs.6060

Answer: (b)

Using Rule 8,

Required percentage = $20/{100 + 20} × 100$

= $50/3 =16{2}/3%$

Answer: (b)

Radha's total percentage expenditure

= (40 + 20 + 10 + 10)% = 80%

Percentage savings =100 – 80 = 20%

Now, 20% of her total salary = 1500

Her total salary = ${1500 ×100}/20$ = Rs.7500

Using Rule 20,

Here, Monthly income = $100/{100 - (40 + 20 +10 +10)} ×1500$

= $150000/{100 – 80} = 150000/20$ =Rs.7500