model 5 ci with instalments Section-Wise Topic Notes With Detailed Explanation And Example Questions

Answer: (d)

Using Rule 9(i),

Let the value of each instalment be Rs.x

Principal = Present worth of Rs.x due 1 year hence, present worth of Rs. x due 2 years hence

210 = $x/(1 + R/100) + x/(1 + R/100)^2$

210 = $x/(1 + 10/100) + x/(1 + 10/100)^2$

210 = $x/{1 + 1/10} + x/(1 + 1/10)^2$

210 = $x/{11/10} + x/(11/10)^2$

210 = ${10x}/11 + {100x}/121$

210 = ${110x + 100x}/121$

210 × 121 = 210 x

$x = {210 × 121}/210$ = Rs.121

Answer: (c)

Using Rule 1,

Let the amount deposited in Post Office be Rs.x lakhs.

Amount deposited in bank = Rs.(3 - x) lakhs

According to the question,

${x × 10 × 1}/{100 × 12} + {(3 - x) × 6 × 1}/{100 × 12}$

= $2000/100000 = 1/50$

10x + 18 - 6x

= $1/50$ × 1200 = 24

4x = 24 - 18 = 6

x = $6/4$ = Rs.$3/2$ lakhs

∴ Required difference = 0

Answer: (d)

Using Rule 1,

Let the income of company in 2010 be Rs.P

According to the question,

A = P$(1 + R/100)^T$

2664000 = P$(1 + 20/100)^2$

2664000 = P$(1 + 1/5)^2$

2664000 = P × $(6/5)^2$

P = ${2664000 × 5 × 5}/{6 × 6}$ = Rs.1850000

Answer: (b)

A = Rs.2550

R = 4% per annum

n = 2 years

Let each of the two equal instalments be x

Present worth = $\text"Instalment"/(1 + r/100)^n$

$P_1 = x/(1 + 4/100)^1 = x/{1 + 1/25} = x/{26/25}$

or $P_1 = 25/26x$

Similarly,

$P_2 = (25/26)^2x = 625/676x$

$P_1 + P_2$ = A

$25/26x + 625/676x$ = 2550

${(650 + 625)x}/676 = 2550$

$1275/676x = 2550$

x = 2550 $× 676/1275$ ⇒ x = Rs.1352

Here, P = Rs.2550, n = 2, r = 4%

Each instalment

= $p/{(100/{100 + r}) + (100/{100 + r})^2$

= $2550/{(100/{100 + 4}) + (100/{100 + 4})^2$

= $2550/{100/104 + (100/104)^2}$

= $2550/{100/104(1 + 100/104)}$

= $2550/{100/104 (204/104)}$

= ${2550 × 104 × 104}/20400 $= Rs.1352