A. Rs.1500
B. Rs.2000
C. Rs.2500
D. Rs.3000
Explanation:
P be the principle and R % per annum be rate
P(1 + R/100)3 = 3149.28 – (i)
P(1 + R/100)2 = 2916 – (ii)
By dividing (i) and (ii)
(1 + R/100) = 3149.28/2916 R/100 = 233.28/2916
or R =233.28/2916 x 100 = 8 %
P(1 +8/100)2 = 2916 or
P × 27/25 × 27/25 = 2916
Or = 1822500/729= Rs.2500
[B].
[C].
[D].
Answer: Option B
Explanation:
Go on multiplying the given numbers by 2, 3, 4, 5, 6.
So, the correct next number is 1440.
[B].
[C].
[D].
Answer: Option B
Explanation:
This is an A.P. in which a = 6, d = 6 and Sn = 1800
| Then, | n | [2a + (n – 1)d] = 1800 |
| 2 |
| n | [2 x 6 + (n – 1) x 6] = 1800 | |
| 2 |
3n (n + 1) = 1800
n(n + 1) = 600
n2 + n – 600 = 0
n2 + 25n – 24n – 600 = 0
n(n + 25) – 24(n + 25) = 0
(n + 25)(n – 24) = 0
n = 24
Number of terms = 24.
[B].
[C].
[D].
Answer: Option D
Explanation:
Let the number be x and on dividing x by 5, we get k as quotient and 3 as remainder.
x = 5k + 3
x2 = (5k + 3)2
= (25k2 + 30k + 9)
= 5(5k2 + 6k + 1) + 4
On dividing x2 by 5, we get 4 as remainder.
[B].
[C].
[D].
Answer: Option A
Explanation:
| Required run rate = | 282 – (3.2 x 10) | = | 250 | = 6.25 | ||
| 40 | 40 |
Video Explanation: https://youtu.be/GhK9d8tcqvA
[B].
[C].
[D].
Answer: Option D
Explanation:
| For an income of Re. 1 in 9% stock at 96, investment = Rs. | 96 | = Rs. | 32 | ||
| 9 | 3 |
| For an income Re. 1 in 12% stock at 120, investment = Rs. | 120 | = Rs. 10. | ||
| 12 |
| Ratio of investments = | 32 | : 10 = 32 : 30 = 16 : 15. |
| 3 |