a) Rs. 50000
b) Rs. 25000
c) Rs. 150000
d) Rs. 75000
Answer: a
Explanation: Let the initial investment of A and B is 18x and 7x
After 4 months from the start of business,
A invest Rs. 2000 more for each eight months.
Then total investment of A
$$\eqalign{
& = 18x \times 4 + \left( {18x + 2000} \right) \times 8 \cr
& = 72x + 144x + 16000 \cr
& = 216x + 16000 \cr} $$
After 4 months, from the start of business,
B invest Rs. 7000 more for each eight months.
Total investment by B
$$\eqalign{
& = 7x \times 4 + \left( {7x + 7000} \right) \times 8 \cr
& = 28x + 56x + 56000 \cr
& = 84x + 56000 \cr} $$
$$ \Rightarrow \frac{{216x + 16000}}{{84x + 56000}} = \frac{2}{1}$$
216x + 16000 = 168x + 112000
216x – 168x = 112000 – 16000
48x = 96000
x = 2000
Total initial investment of A and B
= (18 + 7) × 2000
= Rs. 50000
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