To earn Rs. 8, investment = Rs. | ❨ | 1620 | x 8 | ❩ | = Rs. 96. |
135 |
∴ Market value of Rs. 100 stock = Rs. 96.
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 |
The value of | ❨ | 1 | + | 1 | + | 1 | ❩ | is: |
log3 60 | log4 60 | log5 60 |
Given expression | = log60 3 + log60 4 + log60 5 |
= log60 (3 x 4 x 5) | |
= log60 60 | |
= 1. |
⟹ log (33 ) = 1.431
⟹ 3 log 3 = 1.431
⟹ log 3 = 0.477
∴ log 9 = log(32 ) = 2 log 3 = (2 x 0.477) = 0.954.
If logx | ❨ | 9 | ❩ | = - | 1 | , then x is equal to: |
16 | 2 |
- | 3 |
4 |
3 |
4 |
81 |
256 |
256 |
81 |
256 |
81 |
logx | ❨ | 9 | ❩ | = - | 1 |
16 | 2 |
⟹ x-1/2 | = | 9 |
16 |
⟹ | 1 | = | 9 |
√x | 16 |
⟹ √x = | 16 |
9 |
⟹ x = | ❨ | 16 | ❩ | 2 |
9 |
⟹ x = | 256 |
81 |
log √8 | is equal to: |
log 8 |
1 |
√8 |
1 |
4 |
1 |
2 |
1 |
8 |
1 |
2 |
log √8 | = | log (8)1/2 | = | ½log 8 | = | 1 | . |
log 8 | log 8 | log 8 | 2 |
For an income of Rs. 6, investment = Rs. | ❨ | 100 | x 6 | ❩ | = Rs. 75. |
8 |
∴ Market value of Rs. 100 stock = Rs. 75.
Then, investment in 15% stock = Rs. (12000 - x).
∴ | 12 | x x + | 15 | x (12000 - x) = 1360. |
120 | 125 |
⟹ | x | + | 3 | (12000 - x) = 1360. |
10 | 25 |
⟹ 5x + 72000 - 6x = 1360 x 50
⟹ x = 4000.
To earn Rs. | 50 | , investment = Rs. 64. |
3 |
To earn Rs. 1500, investment = Rs. | ❨ | 64 x | 3 | x 1500 | ❩ | = Rs. 5760. |
50 |
9 | 3 | % stock at 117 |
4 |
9 | 3 | % stock at 117 |
4 |
Income in 1st case = Rs. | ❨ | 11 | x 143 x 117 | ❩ | = Rs. 1287. |
143 |
Income in 2nd case = Rs. | ❨ | 39 | x 143 x 117 | ❩ | = Rs. 1394.25 |
4 x 117 |
Clearly, 9 | 3 | % stock at 117 is better. |
4 |
The cost price of a Rs. 100 stock at 4 discount, when brokerage is | 1 | % | is: |
4 |
C.P. = Rs. | ❨ | 100 - 4 + | 1 | ❩ | = Rs. 96.25 |
4 |
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